Exam

AWS Import/Export – Certification

~ Last updated on : ~ jayendrapatil ~ 11 Comments

AWS Import/Export Disk

  • AWS Import/Export accelerates moving large amounts of data into and out of AWS using portable storage devices for transport
  • AWS transfers the data directly onto and off of storage devices using Amazon’s high-speed internal network, bypassing the Internet, and can be much faster and more cost effective than upgrading connectivity.
  • AWS Import/Export can be implemented in two different ways
    • AWS Import/Export Disk (Disk)
      • originally the only service offered by AWS for data transfer by mail
      • Disk supports transfers data directly onto and off of storage devices you own using the Amazon high-speed internal network
    • AWS Snowball
      • is generally faster and cheaper to use than Disk for importing data into Amazon S3
  • AWS Import/Export supports
    • importing data to several types of AWS storage, including EBS snapshots, S3 buckets, and Glacier vaults.
    • exporting data out from S3 only
  • Data load typically begins the next business day after the storage device arrives at AWS and after the data export or import completes, the storage device is returned

Ideal Usage Patterns

  • AWS Import/Export is ideal for transferring large amounts of data in and out of the AWS cloud, especially in cases where transferring the data over the Internet would be too slow (a week or more) or too costly.
  • Common use cases include
    • first time migration – initial data upload to AWS
    • content distribution or regular data interchange to/from your customers or business associates,
    • off-site backup – transfer to Amazon S3 or Amazon Glacier for off-site backup and archival storage, and
    • disaster recovery – quick retrieval (export) of large backups from Amazon S3 or Amazon Glacier

AWS Import/Export Disk Jobs

  • AWS Import/Export jobs can be created in 2 steps
    • Submit a Job request to AWS where  each job corresponds to exactly one storage device
    • Send your storage device to AWS, which after the data is uploaded or downloaded is returned back
  • AWS Import/Export jobs can be created
    • using a command line tool, which requires no programming or
    • programmatically using the AWS SDK for Java or the REST API to send requests to AWS or
    • even through third party tools
  • AWS Import/Export Data Encrption
    • supports data encryption methods
      • PIN-code encryption, Hardware-based device encryption that uses a physical PIN pad for access to the data.
      • TrueCrypt software encryption, Disk encryption using TrueCrypt, which is an open-source encryption application.
    • Creating an import or export job with encryption requires providing the PIN code or password for the selected encryption method
    • Although is is not mandatory for the data to be encrypted for import jobs, it is highly recommended
    • All export jobs require data encryption can use either hardware encryption or software encryption or both methods.
  • AWS Import/Export supported Job Types
    • Import to S3
    • Import to Glacier (Import to Glacier is no longer supported by AWS. Refer Updates)
    • Import to EBS
    • Export to S3
  • AWS erases the device after every import job prior to return shipping.

Guidelines and Limitations

  • AWS Import/Export does not support Server-Side Encryption (SSE) when importing data.
  • Maximum file size of a single file or object to be imported is 5 TB. Files and objects larger than 5 TB won’t be imported.
  • Maximum device capacity is 16 TB for Amazon Simple Storage Service (Amazon S3) and Amazon EBS jobs.
  • Maximum device capacity is 4 TB for Amazon Glacier jobs.
  • AWS Import/Export exports only the latest version from an Amazon S3 bucket that has versioning turned on.

AWS Certification Exam Practice Questions

  • Questions are collected from Internet and the answers are marked as per my knowledge and understanding (which might differ with yours).
  • AWS services are updated everyday and both the answers and questions might be outdated soon, so research accordingly.
  • AWS exam questions are not updated to keep up the pace with AWS updates, so even if the underlying feature has changed the question might not be updated
  • Open to further feedback, discussion and correction.
  1. You are working with a customer who has 10 TB of archival data that they want to migrate to Amazon Glacier. The customer has a 1-Mbps connection to the Internet. Which service or feature provides the fastest method of getting the data into Amazon Glacier?
    1. Amazon Glacier multipart upload
    2. AWS Storage Gateway
    3. VM Import/Export
    4. AWS Import/Export (Normal upload will take ~900 days as the internet max speed is capped)

References

AWS Associate Certification Exams – Preparation – Sample Questions

~ Last updated on : ~ jayendrapatil ~ 181 Comments

AWS Solution Architect & SysOps Associate Certification Exams Preparation & Sample Questions

I recently passed AWS Solution Architect – Associate (90%) & SysOps – Associate (81%) certification exams.

I would like to share my preparation leading to and experience for the exams

  • AWS Certification exams are pretty tough to crack as they cover a lot of topics from a wide range of services offered by them.
  • I cleared both the Solution Architect and SysOps Associate certifications in a time frame of 2 months.
  • I had 6 months of prior hands-on experience with AWS primarily on IAM, VPC, EC2, S3 & RDS which helped a lot
  • There are lot of resources online which can be helpful but are overwhelming as well as misguide you (I found lot of dumps which have sample exam questions but the answers are marked wrong)
  • AWS Associate certifications although can be cleared with complete theoretical knowledge, a bit of hands on really helps a lot.
  • Also, AWS services are update literally everyday with new features being added, issues resolved and so on, which the exam questions surely don’t keep a track off. Not sure how often the exam questions are updated.
  • So my suggestion is if you see a question which focuses on a scenario which added latest by AWS within a month, still don’t go with that answer and stick to the answer which was relevant before the update for e.g. encryption of Root volume usually made in the certification exam with options to use external tools and was enabled by AWS recently.

AWS Certification Exam Preparation

As I mentioned there are lot of resources and courses online for the Certification exam which can be overwhelming, this is what I did for my preparation to clear the exams

    • Went through AWS Certification Preparation guide
    • Went through the AWS Solution Architect & SysOps blue print thoroughly as it mentions the topics and the weightage in the exam
    • Purchased the acloud guru course from udemy (got it for $10 on discount) for both the AWS Certified Solutions Architect – Associate 2017 and AWS Certified SysOps Administrator – Associate 2017 course, which greatly helped to have a clear picture of the the format, topics and relevant sections
    • Signed up with AWS for the Free Tier account which provides a lot of the Services to be tried for free with certain limits which are more then enough to get things going. Be sure to decommission anything, if you using any thing beyond the free limits, preventing any surprises 🙂
    • Also, used the QwikLabs for all the introductory courses which are free and allow you to try out the services multiple times (I think its max 5, as I got the warnings couple of times)
    • Update: Qwiklabs seems to have reduced the free courses quite a lot and now provide targeted labs for AWS Certification exams which are charged
    • Went through the few Whitepapers especially the
    • Read the FAQs atleast for the important topics, as they cover important points and are good for quick review
    • Went through multiple sites to consolidate the Sample exam questions and worked on them to get the correct answers. I have tried to consolidate them further in this blog topic wise.
    • Went through multiple discussion topics on the acloud guru course which are pretty interesting and provides further insights and some of them are actually certification exam questions
    • I did not purchase the AWS Practice exams, as the questions are available all around. But if you want to check the format, it might be useful.
    • Opinion : acloud guru course are good by itself but is not sufficient to pass the exam but might help to counter about 50-60% of exam questions
    • Also, if you are well prepared the time for the certification exam is more then enough and I could answer all the questions within an hour and was able to run a review on all them once.
    • Important Exam Time Tip: Only mark the questions which you doubt as Mark for Review and then go through them only. I did the mistake marking quite a few as Mark for Review, even though I was confident on the answers, and wasting time on them again.
    • You can also check on

Braincert-AWS-Certified-SA-Professional-Practice-Exam

Udemy AWS Certified Solution Architect - Associate Practice Tests

AWS Associate Certification Exam Important Topics

AWS SWF – Simple Workflow Overview – Certification

~ Last updated on : ~ jayendrapatil ~ 11 Comments

AWS SWF – Simple Workflow

  • AWS SWF makes it easy to build applications that coordinate work across distributed components
  • SWF makes it easier to develop asynchronous and distributed applications by providing a programming model and infrastructure for coordinating distributed components, tracking and maintaining their execution state in a reliable way
  • SWF does the following
    • stores metadata about a workflow and its component parts.
    • stores task for workers and queues them until a Worker needs them.
    • assigns task to workers, which can run either on cloud or on-premises
    • routes information between executions of a workflow and the associated Workers.
    • tracks the progress of workers on Tasks, with configurable timeouts.
    • maintains workflow state in a durable fashion
  • SWF helps coordinating tasks across the application which involves managing intertask dependencies, scheduling, and concurrency in accordance with the logical flow of the application.
  • SWF gives full control over implementing tasks and coordinating them without worrying about underlying complexities such as tracking their progress and maintaining their state.
  • SWF tracks and maintains the workflow state in a durable fashion, so that the application is resilient to failures in individual components, which can be implemented, deployed, scaled, and modified independently
  • SWF offers capabilities to support a variety of application requirements and is suitable for a range of use cases that require coordination of tasks, including media processing, web application back-ends, business process workflows, and analytics pipelines.

Simple Workflow Concepts

AWS SWF Components

  • Workflow
    • Fundamental concept in SWF is the Workflow, which is the automation of a business process
    • A workflow is a set of activities that carry out some objective, together with logic that coordinates the activities.
  • Workflow Execution
    • A workflow execution is a running instance of a workflow
  • Workflow History
    • SWF maintains the state and progress of each workflow execution in its Workflow History, which saves the application from having to store the state in a durable way.
    • It enables applications to be stateless as all information about a workflow execution is stored in its workflow history.
    • For each workflow execution, the history provides a record of which activities were scheduled, their current status, and their results. The workflow execution uses this information to determine next steps.
    • History provides a detailed audit trail that can be used to monitor running workflow executions and verify completed workflow executions.
    • Operations that do not change the state of the workflow for e.g. polling execution do not typically appear in the workflow history
    • Markers can be used to record information in the workflow history of a workflow execution that is specific to the use case
  • Domain
    • Each workflow runs in an AWS resource called a Domain, which controls the workflow’s scope
    • An AWS account can have multiple domains, with each containing multiple workflows
    • Workflows in different domains cannot interact with each other
  • Activities
    • Designing an SWF workflow, Activities need to be precisely defined and then registered with SWF as an activity type with information such as name, version and timeout
  • Activity Task & Activity Worker
    • An Activity Worker is a program that receives activity tasks, performs them, and provides results back. An activity worker can be a program or even a person who performs the task using an activity worker software
    • Activity tasks—and the activity workers that perform them can
      • run synchronously or asynchronously, can be distributed across multiple computers, potentially in different geographic regions, or run on the same computer,
      • be written in different programming languages and run on different operating systems
      • be created that are long-running, or that may fail, time out require restarts or that may complete with varying throughput & latency
  • Decider
    • A Decider implements a Workflow’s coordination logic.
    • Decider schedules activity tasks, provides input data to the activity workers, processes events that arrive while the workflow is in progress, and ends (or closes) the workflow when the objective has been completed.
    • Decider directs the workflow by receiving decision tasks from SWF and responding back to SWF with decisions. A decision represents an action or set of actions which are the next steps in the workflow which can either be to schedule an activity task, set timers to delay the execution of an activity task, to request cancellation of activity tasks already in progress, and to complete or close the workflow.
  • Workers and Deciders are both stateless, and can respond to increased traffic by simply adding additional Workers and Deciders as needed
  • Role of  SWF service is to function as a reliable central hub through which data is exchanged between the decider, the activity workers, and other relevant entities such as the person administering the workflow.
  • Mechanism by which both the activity workers and the decider receive their tasks (activity tasks and decision tasks resp.) is by polling the SWF
  • SWF allows “long polling”, requests will be held open for up to 60 seconds if necessary, to reduce network traffic and unnecessary processing
  • SWF informs the decider of the state of the workflow by including with each decision task, a copy of the current workflow execution history. The workflow execution history is composed of events, where an event represents a significant change in the state of the workflow execution for e.g events would be the completion of a task, notification that a task has timed out, or the expiration of a timer that was set earlier in the workflow execution. The history is a complete, consistent, and authoritative record of the workflow’s progress

Workflow Implementation & Execution

  1. Implement Activity workers with the processing steps in the Workflow.
  2. Implement Decider with the coordination logic of the Workflow.
  3. Register the Activities and workflow with SWF.
  4. Start the Activity workers and Decider. Once started, the decider and activity workers should start polling Amazon SWF for tasks.
  5. Start one or more executions of the Workflow. Each execution runs independently and can be provided with its own set of input data.
  6. When an execution is started, SWF schedules the initial decision task. In response, the decider begins generating decisions which initiate activity tasks. Execution continues until your decider makes a decision to close the execution.
  7. View and Track workflow executions

AWS Certification Exam Practice Questions

  • Questions are collected from Internet and the answers are marked as per my knowledge and understanding (which might differ with yours).
  • AWS services are updated everyday and both the answers and questions might be outdated soon, so research accordingly.
  • AWS exam questions are not updated to keep up the pace with AWS updates, so even if the underlying feature has changed the question might not be updated
  • Open to further feedback, discussion and correction.
  1. What does Amazon SWF stand for?
    1. Simple Web Flow
    2. Simple Work Flow
    3. Simple Wireless Forms
    4. Simple Web Form
  2. Regarding Amazon SWF, the coordination logic in a workflow is contained in a software program called a ____.
    1. Handler
    2. Decider
    3. Coordinator
    4. Worker
  3. For which of the following use cases are Simple Workflow Service (SWF) and Amazon EC2 an appropriate solution? Choose 2 answers
    1. Using as an endpoint to collect thousands of data points per hour from a distributed fleet of sensors
    2. Managing a multi-step and multi-decision checkout process of an e-commerce website
    3. Orchestrating the execution of distributed and auditable business processes
    4. Using as an SNS (Simple Notification Service) endpoint to trigger execution of video transcoding jobs
    5. Using as a distributed session store for your web application
  4. Amazon SWF is designed to help users…
    1. … Design graphical user interface interactions
    2. … Manage user identification and authorization
    3. … Store Web content
    4. … Coordinate synchronous and asynchronous tasks which are distributed and fault tolerant.
  5. What does a “Domain” refer to in Amazon SWF?
    1. A security group in which only tasks inside can communicate with each other
    2. A special type of worker
    3. A collection of related Workflows
    4. The DNS record for the Amazon SWF service
  6. Your company produces customer commissioned one-of-a-kind skiing helmets combining nigh fashion with custom technical enhancements Customers can show oft their Individuality on the ski slopes and have access to head-up-displays. GPS rear-view cams and any other technical innovation they wish to embed in the helmet. The current manufacturing process is data rich and complex including assessments to ensure that the custom electronics and materials used to assemble the helmets are to the highest standards Assessments are a mixture of human and automated assessments you need to add a new set of assessment to model the failure modes of the custom electronics using GPUs with CUD across a cluster of servers with low latency networking. What architecture would allow you to automate the existing process using a hybrid approach and ensure that the architecture can support the evolution of processes over time? [PROFESSIONAL]
    1. Use AWS Data Pipeline to manage movement of data & meta-data and assessments. Use an auto-scaling group of G2 instances in a placement group. (Involves mixture of human assessments)
    2. Use Amazon Simple Workflow (SWF) to manage assessments, movement of data & meta-data. Use an autoscaling group of G2 instances in a placement group. (Human and automated assessments with GPU and low latency networking)
    3. Use Amazon Simple Workflow (SWF) to manage assessments movement of data & meta-data. Use an autoscaling group of C3 instances with SR-IOV (Single Root I/O Virtualization). (C3 and SR-IOV won’t provide GPU as well as Enhanced networking needs to be enabled)
    4. Use AWS data Pipeline to manage movement of data & meta-data and assessments use auto-scaling group of C3 with SR-IOV (Single Root I/O virtualization). (Involves mixture of human assessments)
  7. Your startup wants to implement an order fulfillment process for selling a personalized gadget that needs an average of 3-4 days to produce with some orders taking up to 6 months you expect 10 orders per day on your first day. 1000 orders per day after 6 months and 10,000 orders after 12 months. Orders coming in are checked for consistency men dispatched to your manufacturing plant for production quality control packaging shipment and payment processing. If the product does not meet the quality standards at any stage of the process employees may force the process to repeat a step Customers are notified via email about order status and any critical issues with their orders such as payment failure. Your case architecture includes AWS Elastic Beanstalk for your website with an RDS MySQL instance for customer data and orders. How can you implement the order fulfillment process while making sure that the emails are delivered reliably? [PROFESSIONAL]
    1. Add a business process management application to your Elastic Beanstalk app servers and re-use the ROS database for tracking order status use one of the Elastic Beanstalk instances to send emails to customers. (Would use a SWF instead of BPM)
    2. Use SWF with an Auto Scaling group of activity workers and a decider instance in another Auto Scaling group with min/max=1. Use the decider instance to send emails to customers. (Decider sending emails might not be reliable)
    3. Use SWF with an Auto Scaling group of activity workers and a decider instance in another Auto Scaling group with min/max=1. Use SES to send emails to customers.
    4. Use an SQS queue to manage all process tasks. Use an Auto Scaling group of EC2 Instances that poll the tasks and execute them. Use SES to send emails to customers. (Does not provide an ability to repeat a step)
  8. Select appropriate use cases for SWF with Amazon EC2? (Choose 2)
    1. Video encoding using Amazon S3 and Amazon EC2. In this use case, large videos are uploaded to Amazon S3 in chunks. Application is built as a workflow where each video file is handled as one workflow execution.
    2. Processing large product catalogs using Amazon Mechanical Turk. While validating data in large catalogs, the products in the catalog are processed in batches. Different batches can be processed concurrently.
    3. Order processing system with Amazon EC2, SQS, and SimpleDB. Use SWF notifications to orchestrate an order processing system running on EC2, where notifications sent over HTTP can trigger real-time processing in related components such as an inventory system or a shipping service.
    4. Using as an SQS (Simple Queue Service) endpoint to trigger execution of video transcoding jobs.
  9. When you register an activity in Amazon SWF, you provide the following information, except:
    1. a name
    2. timeout values
    3. a domain
    4. version
  10. Regarding Amazon SWF, at times you might want to record information in the workflow history of a workflow execution that is specific to your use case. ____ enable you to record information in the workflow execution history that you can use for any custom or scenario-specific purpose.
    1. Markers
    2. Tags
    3. Hash keys
    4. Events
  11. Which of the following statements about SWF are true? Choose 3 answers.
    1. SWF tasks are assigned once and never duplicated
    2. SWF requires an S3 bucket for workflow storage
    3. SWF workflow executions can last up to a year
    4. SWF triggers SNS notifications on task assignment
    5. SWF uses deciders and workers to complete tasks
    6. SWF requires at least 1 EC2 instance per domain

References

AWS Tags – Resource Groups – Tag Editor

~ Last updated on : ~ jayendrapatil ~ 2 Comments

AWS Tags

  • Tags are key/value pairs that can be attached to AWS resources
  • Tags are metadata: that means that they don’t actually do anything, they’re purely for labeling purposes and helps to organize AWS resources
  • Tagging allows the user to assign her own (words/phrases/labels) metadata to each resource in the form of tags.
  • Tags don’t have any semantic meaning to the resources it is assigned and are interpreted strictly as a string of characters
  • Tags can
    • help to manage AWS resources & services for e.g. instances, images, security groups, etc.
    • help categorize AWS resources in different ways, for e.g., by purpose, owner (Developer, Finance, etc), or environment (DEV, TEST, PROD, etc).
    • help search and filter the resources
    • be used as a mechanism to organize resource costs on the cost allocation report.
  • Tags are not automatically assigned to the resources, however, are (sometimes) inherited for e.g. services such as Auto Scaling, Elastic Beanstalk, and CloudFormation can create other resources, such as RDS or EC2 instances, and usually tag that resource with a reference to itself. These tags do count toward the total tag limit for a resource
  • Tags can be defined using the
    • AWS Management Console,
    • AWS CLI
    • Amazon API.
  • Tags can be assigned only to resources that already exist and cannot be assigned when you create a resource; for e.g., when you use the run-instances AWS CLI command.
  • However, when using the AWS Management console, some resource creation screens enable you to specify tags that are applied immediately after the resource is created.
  • Each tag consists of a key and value
    • key and an optional value, both of which are user-controlled
    • defining a new tag that has the same key as an existing tag on that resource, the new value overwrites the old value.
    • keys and values can be edited, removed from a resource at any time.
    • value can be defined as an empty string, but can’t be set to null.
  • IAM allows you the ability to control which users in the AWS account have permission to create, edit, or delete tags.
  • Common examples of tags are Environment, Application, Owner, Cost Center, Purpose, Stack, etc.

Tags Restriction

  • Maximum number of tags per resource – 50
  • Maximum key length – 128 Unicode characters in UTF-8
  • Maximum value length – 256 Unicode characters in UTF-8
  • Tag keys and values are case-sensitive.
  • Do not use the aws: prefix in the tag names or values because it is reserved for AWS use. Tags with this prefix can’t be edited or deleted and they do not count against the tags per resource limit.
  • Tags allowed characters are: letters, spaces, and numbers representable in UTF-8, plus the following special characters: + – = . _ : / @.

Tagging Strategy

  • AWS does not enforce any tagging naming conventions and can be used as per the user convenience
  • As the number of tags allows per resource are limited, Complex Tagging can be used for e.g. keyName = value1|value2|value3 or keyName = key1|value1;key2|value2

EC2 Resources Tags

  • For tags on EC2 instances, instances can’t terminate, stop, or delete a resource based solely on its tags; the resource identifier must be specified
  • Public or shared resources can be tagged, but the tags assigned are available only to the AWS account and not to the other accounts sharing the resource.
  • Almost all resources can be tagged, with some can only be tagged using API actions or the command line or during creation.

Cost Allocation Tags

  • Tags can be used as a mechanism to organize the resource costs on the cost allocation report.
  • Cost allocation tags can be used to categorize and track AWS costs.
  • When tags are applied to AWS resources such as EC2 instances or S3 buckets and activated in the billing console, AWS generates a cost allocation report as a (CSV file) with the usage and costs aggregated by active tags.
  • Tags can be applied so that they represent business categories (such as cost centers, application names, or owners) to organize costs across multiple services.
  • Cost allocation report includes all of the AWS costs for each billing period and includes both tagged and untagged resources
  • Tags can also be used to filter views in Cost Explorer

Access Control Tags

Resource Groups

  • A Resource Group is a collection of resources that share one or more tags
  • Resource groups help combine information for multiple resources and services on a single screen for e.g. for a Dev tag there might be multiple resources for ELB, EC2, and RDS. Using Resource Groups all the resources and their status can be views on a single page

Tag Editor

  • Tag Editor allows the addition of tags to multiple resources at once
  • Tag Editor allows searching of resources using tags and then add, edit, remove tags for these resources

AWS Certification Exam Practice Questions

  • Questions are collected from Internet and the answers are marked as per my knowledge and understanding (which might differ with yours).
  • AWS services are updated everyday and both the answers and questions might be outdated soon, so research accordingly.
  • AWS exam questions are not updated to keep up the pace with AWS updates, so even if the underlying feature has changed the question might not be updated
  • Open to further feedback, discussion and correction.
  1. Fill in the blanks: _________ let you categorize your EC2 resources in different ways, for example, by purpose, owner, or environment.
    1. Wildcards
    2. Pointers
    3. Tags
    4. Special filters
  2. Please select the Amazon EC2 resource, which can be tagged.
    1. Key pairs
    2. Elastic IP addresses
    3. Placement groups
    4. Amazon EBS snapshots
  3. Can the string value of ‘Key’ be prefixed with aws:?
    1. No
    2. Only for EC2 not S3
    3. Yes
    4. Only for S3 not EC
  4. What is the maximum key length of a tag?
    1. 512 Unicode characters
    2. 64 Unicode characters
    3. 256 Unicode characters
    4. 128 Unicode characters
  5. An organization has launched 5 instances: 2 for production and 3 for testing. The organization wants that one particular group of IAM users should only access the test instances and not the production ones. How can the organization set that as a part of the policy?
    1. Launch the test and production instances in separate regions and allow region wise access to the group (possible using location constraint condition but not flexible)
    2. Define the IAM policy which allows access based on the instance ID (not flexible as it would change)
    3. Create an IAM policy with a condition which allows access to only small instances (not flexible as it would change)
    4. Define the tags on the test and production servers and add a condition to the IAM policy which allows access to specific tags (possible using ResourceTag condition)
  6. A user has launched multiple EC2 instances for the purpose of development and testing in the same region. The user wants to find the separate cost for the production and development instances. How can the user find the cost distribution?
    1. The user should download the activity report of the EC2 services as it has the instance ID wise data
    2. It is not possible to get the AWS cost usage data of single region instances separately
    3. User should use Cost Distribution Metadata and AWS detailed billing
    4. User should use Cost Allocation Tags and AWS billing reports
  7. An organization is using cost allocation tags to find the cost distribution of different departments and projects. One of the instances has two separate tags with the key/value as “InstanceName/HR”, “CostCenter/HR”. What will AWS do in this case?
    1. InstanceName is a reserved tag for AWS. Thus, AWS will not allow this tag
    2. AWS will not allow the tags as the value is the same for different keys
    3. AWS will allow tags but will not show correctly in the cost allocation report due to the same value of the two separate keys
    4. AWS will allow both the tags and show properly in the cost distribution report
  8. A user is launching an instance. He is on the “Tag the instance” screen. Which of the below mentioned information will not help the user understand the functionality of an AWS tag?
    1. Each tag will have a key and value
    2. The user can apply tags to the S3 bucket
    3. The maximum value of the tag key length is 64 unicode characters
    4. AWS tags are used to find the cost distribution of various resources
  9. Your system recently experienced down time during the troubleshooting process. You found that a new administrator mistakenly terminated several production EC2 instances. Which of the following strategies will help prevent a similar situation in the future? The administrator still must be able to:- launch, start stop, and terminate development resources. – launch and start production instances.
    1. Create an IAM user, which is not allowed to terminate instances by leveraging production EC2 termination protection. (EC2 termination protection is enabled on EC2 instance)
    2. Leverage resource based tagging along with an IAM user, which can prevent specific users from terminating production EC2 resources. (Identify production resources using tags and add explicit deny)
    3. Leverage EC2 termination protection and multi-factor authentication, which together require users to authenticate before terminating EC2 instances. (Does not still prevent user from terminating instance)
    4. Create an IAM user and apply an IAM role, which prevents users from terminating production EC2 instances. (Role is not applied to User but assumed by the User also need a way to identify production EC2 instances)
  10. Your manager has requested you to tag EC2 instances to organize and manage a load balancer. Which of the following statements about tag restrictions is incorrect?
    1. The maximum key length is 127 Unicode characters.
    2. The maximum value length is 255 Unicode characters.
    3. Tag keys and values are case sensitive.
    4. The maximum number of tags per load balancer is 20. (50 is the limit)
  11. What is the maximum number of tags that a user can assign to an EC2 instance?
    1. 50
    2. 10
    3. 5
    4. 25

 

CloudWatch Monitoring Supported AWS Services

~ Last updated on : ~ jayendrapatil ~ 8 Comments

CloudWatch Monitoring Supported AWS Services

  • CloudWatch offers either basic or detailed monitoring for supported AWS services.
  • Basic monitoring means that a service sends data points to CloudWatch every five minutes.
  • Detailed monitoring means that a service sends data points to CloudWatch every minute.
  • If the AWS service supports both basic and detailed monitoring, the basic would be enabled by default and the detailed monitoring needs to be enabled for details metrics

AWS Services with Monitoring support

  • Auto Scaling
    • By default, basic monitoring is enabled when the launch configuration is created using the AWS Management Console, and detailed monitoring is enabled when the launch configuration is created using the AWS CLI or an API
    • Auto Scaling sends data to CloudWatch every 5 minutes by default when created from Console.
    • For an additional charge, you can enable detailed monitoring for Auto Scaling, which sends data to CloudWatch every minute.
  • Amazon CloudFront
    • Amazon CloudFront sends data to CloudWatch every minute by default.
  • Amazon CloudSearch
    • Amazon CloudSearch sends data to CloudWatch every minute by default.
  • Amazon CloudWatch Events
    • Amazon CloudWatch Events sends data to CloudWatch every minute by default.
  • Amazon CloudWatch Logs
    • Amazon CloudWatch Logs sends data to CloudWatch every minute by default.
  • Amazon DynamoDB
    • Amazon DynamoDB sends data to CloudWatch every minute for some metrics and every 5 minutes for other metrics.
  • Amazon EC2 Container Service
    • Amazon EC2 Container Service sends data to CloudWatch every minute.
  • Amazon ElastiCache
    • Amazon ElastiCache sends data to CloudWatch every minute.
  • Amazon Elastic Block Store
    • Amazon Elastic Block Store sends data to CloudWatch every 5 minutes.
    • Provisioned IOPS SSD (io1) volumes automatically send one-minute metrics to CloudWatch.
  • Amazon Elastic Compute Cloud
    • Amazon EC2 sends data to CloudWatch every 5 minutes by default. For an additional charge, you can enable detailed monitoring for Amazon EC2, which sends data to CloudWatch every minute.
  • Elastic Load Balancing
    • Elastic Load Balancing sends data to CloudWatch every minute.
  • Amazon Elastic MapReduce
    • Amazon Elastic MapReduce sends data to CloudWatch every 5 minutes.
  • Amazon Elasticsearch Service
    • Amazon Elasticsearch Service sends data to CloudWatch every minute.
  • Amazon Kinesis Streams
    • Amazon Kinesis Streams sends data to CloudWatch every minute.
  • Amazon Kinesis Firehose
    • Amazon Kinesis Firehose sends data to CloudWatch every minute.
  • AWS Lambda
    • AWS Lambda sends data to CloudWatch every minute.
  • Amazon Machine Learning
    • Amazon Machine Learning sends data to CloudWatch every 5 minutes.
  • AWS OpsWorks
    • AWS OpsWorks sends data to CloudWatch every minute.
  • Amazon Redshift
    • Amazon Redshift sends data to CloudWatch every minute.
  • Amazon Relational Database Service
    • Amazon Relational Database Service sends data to CloudWatch every minute.
  • Amazon Route 53
    • Amazon Route 53 sends data to CloudWatch every minute.
  • Amazon Simple Notification Service
    • Amazon Simple Notification Service sends data to CloudWatch every 5 minutes.
  • Amazon Simple Queue Service
    • Amazon Simple Queue Service sends data to CloudWatch every 5 minutes.
  • Amazon Simple Storage Service
    • Amazon Simple Storage Service sends data to CloudWatch once a day.
  • Amazon Simple Workflow Service
    • Amazon Simple Workflow Service sends data to CloudWatch every 5 minutes.
  • AWS Storage Gateway
    • AWS Storage Gateway sends data to CloudWatch every 5 minutes.
  • AWS WAF
    • AWS WAF sends data to CloudWatch every minute.
  • Amazon WorkSpaces
    • Amazon WorkSpaces sends data to CloudWatch every 5 minutes.

AWS Certification Exam Practice Questions

  • Questions are collected from Internet and the answers are marked as per my knowledge and understanding (which might differ with yours).
  • AWS services are updated everyday and both the answers and questions might be outdated soon, so research accordingly.
  • AWS exam questions are not updated to keep up the pace with AWS updates, so even if the underlying feature has changed the question might not be updated
  • Open to further feedback, discussion and correction.
  1. What is the minimum time Interval for the data that Amazon CloudWatch receives and aggregates?
    1. One second
    2. Five seconds
    3. One minute
    4. Three minutes
    5. Five minutes
  2. In the ‘Detailed’ monitoring data available for your Amazon EBS volumes, Provisioned IOPS volumes automatically send _____ minute metrics to Amazon CloudWatch.
    1. 3
    2. 1
    3. 5
    4. 2
  3. Using Amazon CloudWatch’s Free Tier, what is the frequency of metric updates, which you receive?
    1. 5 minutes
    2. 500 milliseconds.
    3. 30 seconds
    4. 1 minute
  4. What is the type of monitoring data (for Amazon EBS volumes) which is available automatically in 5-minute periods at no charge called?
    1. Basic
    2. Primary
    3. Detailed
    4. Local
  5. A user has created an Auto Scaling group using CLI. The user wants to enable CloudWatch detailed monitoring for that group. How can the user configure this?
    1. When the user sets an alarm on the Auto Scaling group, it automatically enables detail monitoring
    2. By default detailed monitoring is enabled for Auto Scaling (Detailed monitoring is enabled when you create the launch configuration using the AWS CLI or an API)
    3. Auto Scaling does not support detailed monitoring
    4. Enable detail monitoring from the AWS console
  6. A user is trying to understand the detailed CloudWatch monitoring concept. Which of the below mentioned services provides detailed monitoring with CloudWatch without charging the user extra?
    1. AWS Auto Scaling
    2. AWS Route 53
    3. AWS EMR
    4. AWS SNS
  7. A user is trying to understand the detailed CloudWatch monitoring concept. Which of the below mentioned services does not provide detailed monitoring with CloudWatch?
    1. AWS EMR
    2. AWS RDS
    3. AWS ELB
    4. AWS Route53
  8. A user has enabled detailed CloudWatch monitoring with the AWS Simple Notification Service. Which of the below mentioned statements helps the user understand detailed monitoring better?
    1. SNS will send data every minute after configuration
    2. There is no need to enable since SNS provides data every minute
    3. AWS CloudWatch does not support monitoring for SNS
    4. SNS cannot provide data every minute
  9. A user has configured an Auto Scaling group with ELB. The user has enabled detailed CloudWatch monitoring on Auto Scaling. Which of the below mentioned statements will help the user understand the functionality better?
    1. It is not possible to setup detailed monitoring for Auto Scaling
    2. In this case, Auto Scaling will send data every minute and will charge the user extra
    3. Detailed monitoring will send data every minute without additional charges
    4. Auto Scaling sends data every minute only and does not charge the user

References

AWS Storage Options – Whitepaper – Certification

~ Last updated on : ~ jayendrapatil ~ 58 Comments

Storage Options Whitepaper

AWS Storage Options is one of the most important Whitepaper for AWS Solution Architect Professional Certification exam and covers a brief summary of each AWS storage options, their ideal usage patterns, anti-patterns, performance, durability and availability, scalability etc.

Overview

  • AWS offers multiple cloud-based storage options. Each has a unique combination of performance, durability, availability, cost, and interface, as well as other characteristics such as scalability and elasticity
  • All storage options are ideally suited for some uses cases and there are certain Anti-Patterns which should be taken in account while making a storage choice

AWS Various Storage Options

Amazon S3 & Amazon Glacier

More Details @ AWS Storage Options – S3 & Glacier

Amazon Elastic Block Store (EBS) & Instance Store Volumes

More details @ AWS Storage Options – EBS & Instance Store

Amazon RDS, DynamoDB & Database on EC2

More details @ AWS Storage Options – RDS, DynamoDB & Database on EC2

Amazon SQS & Redshift

More details @ AWS Storage Options – SQS & Redshift

Amazon CloudFront & Elasticache

More details @ AWS Storage Options – CloudFront & ElastiCache

Amazon Storage Gateway & Import/Export

More details @ AWS Storage Options – Storage Gateway & Import/Export

AWS Certification Exam Practice Questions

  • Questions are collected from Internet and the answers are marked as per my knowledge and understanding (which might differ with yours).
  • AWS services are updated everyday and both the answers and questions might be outdated soon, so research accordingly.
  • AWS exam questions are not updated to keep up the pace with AWS updates, so even if the underlying feature has changed the question might not be updated
  • Open to further feedback, discussion and correction.
  1. You are developing a highly available web application using stateless web servers. Which services are suitable for storing session state data? Choose 3 answers.
    1. Elastic Load Balancing
    2. Amazon Relational Database Service (RDS)
    3. Amazon CloudWatch
    4. Amazon ElastiCache
    5. Amazon DynamoDB
    6. AWS Storage Gateway
  2. Your firm has uploaded a large amount of aerial image data to S3. In the past, in your on-premises environment, you used a dedicated group of servers to oaten process this data and used Rabbit MQ, an open source messaging system, to get job information to the servers. Once processed the data would go to tape and be shipped offsite. Your manager told you to stay with the current design, and leverage AWS archival storage and messaging services to minimize cost. Which is correct? [PROFESSIONAL]
    1. Use SQS for passing job messages, use Cloud Watch alarms to terminate EC2 worker instances when they become idle. Once data is processed, change the storage class of the S3 objects to Reduced Redundancy Storage.
    2. Setup Auto-Scaled workers triggered by queue depth that use spot instances to process messages in SQS. Once data is processed, change the storage class of the S3 objects to Reduced Redundancy Storage.
    3. Setup Auto-Scaled workers triggered by queue depth that use spot instances to process messages in SQS. Once data is processed, change the storage class of the S3 objects to Glacier.
    4. Use SNS to pass job messages use Cloud Watch alarms to terminate spot worker instances when they become idle. Once data is processed, change the storage class of the S3 object to Glacier.
  3. You are developing a new mobile application and are considering storing user preferences in AWS, which would provide a more uniform cross-device experience to users using multiple mobile devices to access the application. The preference data for each user is estimated to be 50KB in size. Additionally 5 million customers are expected to use the application on a regular basis. The solution needs to be cost-effective, highly available, scalable and secure, how would you design a solution to meet the above requirements? [PROFESSIONAL]
    1. Setup an RDS MySQL instance in 2 availability zones to store the user preference data. Deploy a public facing application on a server in front of the database to manage security and access credentials
    2. Setup a DynamoDB table with an item for each user having the necessary attributes to hold the user preferences. The mobile application will query the user preferences directly from the DynamoDB table. Utilize STS. Web Identity Federation, and DynamoDB Fine Grained Access Control to authenticate and authorize access
    3. Setup an RDS MySQL instance with multiple read replicas in 2 availability zones to store the user preference data .The mobile application will query the user preferences from the read replicas. Leverage the MySQL user management and access privilege system to manage security and access credentials.
    4. Store the user preference data in S3 Setup a DynamoDB table with an item for each user and an item attribute pointing to the user’ S3 object. The mobile application will retrieve the S3 URL from DynamoDB and then access the S3 object directly utilize STS, Web identity Federation, and S3 ACLs to authenticate and authorize access.
  4. A company is building a voting system for a popular TV show, viewers would watch the performances then visit the show’s website to vote for their favorite performer. It is expected that in a short period of time after the show has finished the site will receive millions of visitors. The visitors will first login to the site using their Amazon.com credentials and then submit their vote. After the voting is completed the page will display the vote totals. The company needs to build the site such that can handle the rapid influx of traffic while maintaining good performance but also wants to keep costs to a minimum. Which of the design patterns below should they use? [PROFESSIONAL]
    1. Use CloudFront and an Elastic Load balancer in front of an auto-scaled set of web servers, the web servers will first can the Login With Amazon service to authenticate the user then process the users vote and store the result into a multi-AZ Relational Database Service instance.
    2. Use CloudFront and the static website hosting feature of S3 with the Javascript SDK to call the Login With Amazon service to authenticate the user, use IAM Roles to gain permissions to a DynamoDB table to store the users vote.
    3. Use CloudFront and an Elastic Load Balancer in front of an auto-scaled set of web servers, the web servers will first call the Login with Amazon service to authenticate the user, the web servers will process the users vote and store the result into a DynamoDB table using IAM Roles for EC2 instances to gain permissions to the DynamoDB table.
    4. Use CloudFront and an Elastic Load Balancer in front of an auto-scaled set of web servers, the web servers will first call the Login. With Amazon service to authenticate the user, the web servers would process the users vote and store the result into an SQS queue using IAM Roles for EC2 Instances to gain permissions to the SQS queue. A set of application servers will then retrieve the items from the queue and store the result into a DynamoDB table
  5. A large real-estate brokerage is exploring the option to adding a cost-effective location-based alert to their existing mobile application. The application backend infrastructure currently runs on AWS. Users who opt in to this service will receive alerts on their mobile device regarding real-estate offers in proximity to their location. For the alerts to be relevant delivery time needs to be in the low minute count. The existing mobile app has 5 million users across the US. Which one of the following architectural suggestions would you make to the customer? [PROFESSIONAL]
    1. Mobile application will submit its location to a web service endpoint utilizing Elastic Load Balancing and EC2 instances. DynamoDB will be used to store and retrieve relevant offers. EC2 instances will communicate with mobile earners/device providers to push alerts back to mobile application. —
    2. Use AWS Direct Connect or VPN to establish connectivity with mobile carriers EC2 instances will receive the mobile applications location through carrier connection: RDS will be used to store and relevant offers. EC2 instances will communicate with mobile carriers to push alerts back to the mobile application
    3. Mobile application will send device location using SQS. EC2 instances will retrieve the relevant offers from DynamoDB. AWS Mobile Push will be used to send offers to the mobile application
    4. Mobile application will send device location using AWS Mobile Push. EC2 instances will retrieve the relevant offers from DynamoDB. EC2 instances will communicate with mobile carriers/device providers to push alerts back to the mobile application.
  6. You are running a news website in the eu-west-1 region that updates every 15 minutes. The website has a worldwide audience and it uses an Auto Scaling group behind an Elastic Load Balancer and an Amazon RDS database. Static content resides on Amazon S3, and is distributed through Amazon CloudFront. Your Auto Scaling group is set to trigger a scale up event at 60% CPU utilization; you use an Amazon RDS extra-large DB instance with 10.000 Provisioned IOPS its CPU utilization is around 80%. While freeable memory is in the 2 GB range. Web analytics reports show that the average load time of your web pages is around 1.5 to 2 seconds, but your SEO consultant wants to bring down the average load time to under 0.5 seconds. How would you improve page load times for your users? (Choose 3 answers) [PROFESSIONAL]
    1. Lower the scale up trigger of your Auto Scaling group to 30% so it scales more aggressively.
    2. Add an Amazon ElastiCache caching layer to your application for storing sessions and frequent DB queries
    3. Configure Amazon CloudFront dynamic content support to enable caching of re-usable content from your site
    4. Switch Amazon RDS database to the high memory extra-large Instance type
    5. Set up a second installation in another region, and use the Amazon Route 53 latency-based routing feature to select the right region.
  7. A read only news reporting site with a combined web and application tier and a database tier that receives large and unpredictable traffic demands must be able to respond to these traffic fluctuations automatically. What AWS services should be used meet these requirements? [PROFESSIONAL]
    1. Stateless instances for the web and application tier synchronized using ElastiCache Memcached in an autoscaling group monitored with CloudWatch. And RDS with read replicas.
    2. Stateful instances for the web and application tier in an autoscaling group monitored with CloudWatch and RDS with read replicas
    3. Stateful instances for the web and application tier in an autoscaling group monitored with CloudWatch. And multi-AZ RDS
    4. Stateless instances for the web and application tier synchronized using ElastiCache Memcached in an autoscaling group monitored with CloudWatch and multi-AZ RDS
  8. You have a periodic Image analysis application that gets some files as input, analyzes them and for each file writes some data in output to a ten file. The number of files in input per day is high and concentrated in a few hours of the day. Currently you have a server on EC2 with a large EBS volume that hosts the input data and the results it takes almost 20 hours per day to complete the process. What services could be used to reduce the elaboration time and improve the availability of the solution? [PROFESSIONAL]
    1. S3 to store I/O files. SQS to distribute elaboration commands to a group of hosts working in parallel. Auto scaling to dynamically size the group of hosts depending on the length of the SQS queue
    2. EBS with Provisioned IOPS (PIOPS) to store I/O files. SNS to distribute elaboration commands to a group of hosts working in parallel Auto Scaling to dynamically size the group of hosts depending on the number of SNS notifications
    3. S3 to store I/O files, SNS to distribute evaporation commands to a group of hosts working in parallel. Auto scaling to dynamically size the group of hosts depending on the number of SNS notifications
    4. EBS with Provisioned IOPS (PIOPS) to store I/O files SOS to distribute elaboration commands to a group of hosts working in parallel Auto Scaling to dynamically size the group to hosts depending on the length of the SQS queue.
  9. A 3-tier e-commerce web application is current deployed on-premises and will be migrated to AWS for greater scalability and elasticity. The web server currently shares read-only data using a network distributed file system The app server tier uses a clustering mechanism for discovery and shared session state that depends on IP multicast The database tier uses shared-storage clustering to provide database fail over capability, and uses several read slaves for scaling. Data on all servers and the distributed file system directory is backed up weekly to off-site tapes. Which AWS storage and database architecture meets the requirements of the application? [PROFESSIONAL]
    1. Web servers store read-only data in S3, and copy from S3 to root volume at boot time. App servers share state using a combination of DynamoDB and IP unicast. Database use RDS with multi-AZ deployment and one or more Read Replicas. Backup web and app servers backed up weekly via AMIs, database backed up via DB snapshots.
    2. Web servers store read-only data in S3, and copy from S3 to root volume at boot time. App servers share state using a combination of DynamoDB and IP unicast. Database use RDS with multi-AZ deployment and one or more Read replicas. Backup web servers app servers, and database backed up weekly to Glacier using snapshots (Snapshots to Glacier don’t work directly with EBS snapshots)
    3. Web servers store read-only data in S3 and copy from S3 to root volume at boot time. App servers share state using a combination of DynamoDB and IP unicast. Database use RDS with multi-AZ deployment. Backup web and app servers backed up weekly via AMIs. Database backed up via DB snapshots (Need Read replicas for scalability and elasticity)
    4. Web servers, store read-only data in an EC2 NFS server, mount to each web server at boot time App servers share state using a combination of DynamoDB and IP multicast Database use RDS with multi-AZ deployment and one or more Read Replicas Backup web and app servers backed up weekly via AMIs database backed up via DB snapshots (IP multicast not available in AWS)
  10. Our company is getting ready to do a major public announcement of a social media site on AWS. The website is running on EC2 instances deployed across multiple Availability Zones with a Multi-AZ RDS MySQL Extra Large DB Instance. The site performs a high number of small reads and writes per second and relies on an eventual consistency model. After comprehensive tests you discover that there is read contention on RDS MySQL. Which are the best approaches to meet these requirements? (Choose 2 answers) [PROFESSIONAL]
    1. Deploy ElasticCache in-memory cache running in each availability zone
    2. Implement sharding to distribute load to multiple RDS MySQL instances (Would distributed read write both, focus is on read contention)
    3. Increase the RDS MySQL Instance size and Implement provisioned IOPS (Would distributed read write both, focus is on read contention)
    4. Add an RDS MySQL read replica in each availability zone
  11. Run 2-tier app with the following: an ELB, three web app server on EC2, and 1 MySQL RDS db. With grown load, db queries take longer and longer and slow down the overall response time for user request. What Options could speed up performance? (Choose 3) [PROFESSIONAL]
    1. Create an RDS read-replica and redirect half of the database read request to it
    2. Cache database queries in amazon ElastiCache
    3. Setup RDS in multi-availability zone mode.
    4. Shard the database and distribute loads between shards.
    5. Use amazon CloudFront to cache database queries.
  12. You have a web application leveraging an Elastic Load Balancer (ELB) In front of the web servers deployed using an Auto Scaling Group Your database is running on Relational Database Service (RDS) The application serves out technical articles and responses to them in general there are more views of an article than there are responses to the article. On occasion, an article on the site becomes extremely popular resulting in significant traffic Increases that causes the site to go down. What could you do to help alleviate the pressure on the infrastructure while maintaining availability during these events? Choose 3 answers [PROFESSIONAL]
    1. Leverage CloudFront for the delivery of the articles.
    2. Add RDS read-replicas for the read traffic going to your relational database
    3. Leverage Elastic Cache for caching the most frequently used data.
    4. Use SQS to queue up the requests for the technical posts and deliver them out of the queue (does not process and would not be real time)
    5. Use Route53 health checks to fail over to an S3 bucket for an error page (more of an error handling then availability)
  13. Your website is serving on-demand training videos to your workforce. Videos are uploaded monthly in high resolution MP4 format. Your workforce is distributed globally often on the move and using company-provided tablets that require the HTTP Live Streaming (HLS) protocol to watch a video. Your company has no video transcoding expertise and it required you might need to pay for a consultant. How do you implement the most cost-efficient architecture without compromising high availability and quality of video delivery? [PROFESSIONAL]
    1. Elastic Transcoder to transcode original high-resolution MP4 videos to HLS. S3 to host videos with lifecycle Management to archive original flies to Glacier after a few days. CloudFront to serve HLS transcoded videos from S3 (Elastic Transcoder for High quality, S3 to host videos cheaply, Glacier for archives and CloudFront for high availability)
    2. A video transcoding pipeline running on EC2 using SQS to distribute tasks and Auto Scaling to adjust the number or nodes depending on the length of the queue S3 to host videos with Lifecycle Management to archive all files to Glacier after a few days CloudFront to serve HLS transcoding videos from Glacier
    3. Elastic Transcoder to transcode original high-resolution MP4 videos to HLS EBS volumes to host videos and EBS snapshots to incrementally backup original rues after a few days. CloudFront to serve HLS transcoded videos from EC2.
    4. A video transcoding pipeline running on EC2 using SQS to distribute tasks and Auto Scaling to adjust the number of nodes depending on the length of the queue. EBS volumes to host videos and EBS snapshots to incrementally backup original files after a few days. CloudFront to serve HLS transcoded videos from EC2
  14. To meet regulatory requirements, a pharmaceuticals company needs to archive data after a drug trial test is concluded. Each drug trial test may generate up to several thousands of files, with compressed file sizes ranging from 1 byte to 100MB. Once archived, data rarely needs to be restored, and on the rare occasion when restoration is needed, the company has 24 hours to restore specific files that match certain metadata. Searches must be possible by numeric file ID, drug name, participant names, date ranges, and other metadata. Which is the most cost-effective architectural approach that can meet the requirements? [PROFESSIONAL]
    1. Store individual files in Amazon Glacier, using the file ID as the archive name. When restoring data, query the Amazon Glacier vault for files matching the search criteria. (Individual files are expensive and does not allow searching by participant names etc)
    2. Store individual files in Amazon S3, and store search metadata in an Amazon Relational Database Service (RDS) multi-AZ database. Create a lifecycle rule to move the data to Amazon Glacier after a certain number of days. When restoring data, query the Amazon RDS database for files matching the search criteria, and move the files matching the search criteria back to S3 Standard class. (As the data is not needed can be stored to Glacier directly and the data need not be moved back to S3 standard)
    3. Store individual files in Amazon Glacier, and store the search metadata in an Amazon RDS multi-AZ database. When restoring data, query the Amazon RDS database for files matching the search criteria, and retrieve the archive name that matches the file ID returned from the database query. (Individual files and Multi-AZ is expensive)
    4. First, compress and then concatenate all files for a completed drug trial test into a single Amazon Glacier archive. Store the associated byte ranges for the compressed files along with other search metadata in an Amazon RDS database with regular snapshotting. When restoring data, query the database for files that match the search criteria, and create restored files from the retrieved byte ranges.
    5. Store individual compressed files and search metadata in Amazon Simple Storage Service (S3). Create a lifecycle rule to move the data to Amazon Glacier, after a certain number of days. When restoring data, query the Amazon S3 bucket for files matching the search criteria, and retrieve the file to S3 reduced redundancy in order to move it back to S3 Standard class. (Once the data is moved from S3 to Glacier the metadata is lost, as Glacier does not have metadata and must be maintained externally)
  15. A document storage company is deploying their application to AWS and changing their business model to support both free tier and premium tier users. The premium tier users will be allowed to store up to 200GB of data and free tier customers will be allowed to store only 5GB. The customer expects that billions of files will be stored. All users need to be alerted when approaching 75 percent quota utilization and again at 90 percent quota use. To support the free tier and premium tier users, how should they architect their application? [PROFESSIONAL]
    1. The company should utilize an amazon simple work flow service activity worker that updates the users data counter in amazon dynamo DB. The activity worker will use simple email service to send an email if the counter increases above the appropriate thresholds.
    2. The company should deploy an amazon relational data base service relational database with a store objects table that has a row for each stored object along with size of each object. The upload server will query the aggregate consumption of the user in questions by first determining the files store by the user, and then querying the stored objects table for respective file sizes) and send an email via amazon simple email service if the thresholds are breached.
    3. The company should write both the content length and the username of the files owner as S3 metadata for the object. They should then create a file watcher to iterate over each object and aggregate the size for each user and send a notification via amazon simple queue service to an emailing service if the storage threshold is exceeded.
    4. The company should create two separated amazon simple storage service buckets one for data storage for free tier users and another for data storage for premium tier users. An amazon simple workflow service activity worker will query all objects for a given user based on the bucket the data is stored
  16. Your company has been contracted to develop and operate a website that tracks NBA basketball statistics. Statistical data to derive reports like “best game-winning shots from the regular season” and more frequently built reports like “top shots of the game” need to be stored durably for repeated lookup. Leveraging social media techniques, NBA fans submit and vote on new report types from the existing data set so the system needs to accommodate variability in data queries and new static reports must be generated and posted daily. Initial research in the design phase indicates that there will be over 3 million report queries on game day by end users and other applications that use this application as a data source. It is expected that this system will gain in popularity over time and reach peaks of 10-15 million report queries of the system on game days. Select the answer that will allow your application to best meet these requirements while minimizing costs. [PROFESSIONAL]
    1. Launch a multi-AZ MySQL Amazon Relational Database Service (RDS) Read Replica connected to your multi AZ master database and generate reports by querying the Read Replica. Perform a daily table cleanup.
    2. Implement a multi-AZ MySQL RDS deployment and have the application generate reports from Amazon ElastiCache for in-memory performance results. Utilize the default expire parameter for items in the cache.
    3. Generate reports from a multi-AZ MySQL Amazon RDS deployment and have an offline task put reports in Amazon Simple Storage Service (S3) and use CloudFront to cache the content. Use a TTL to expire objects daily. (Offline task with S3 storage and CloudFront cache)
    4. Query a multi-AZ MySQL RDS instance and store the results in a DynamoDB table. Generate reports from the DynamoDB table. Remove stale tables daily.

References

AWS Storage Options – SQS & Redshift

~ Last updated on : ~ jayendrapatil ~ 13 Comments

SQS

  • is a temporary data repository for messages  and provides a reliable, highly scalable, hosted message queuing service for temporary storage and delivery of short (up to 256 KB) text-based data messages.
  • supports a virtually unlimited number of queues and supports unordered, at-least-once delivery of messages.

Ideal Usage patterns

  • is ideally suited to any scenario where multiple application components must communicate and coordinate their work in a loosely coupled manner particularly producer consumer scenarios
  • can be used to coordinate a multi-step processing pipeline, where each message is associated with a task that must be processed.
  • enables the number of worker instances to scale up or down, and also enable the processing power of each single worker instance to scale up or down, to suit the total workload, without any application changes.

Anti-Patterns

  • Binary or Large Messages
    • SQS is suited for text messages with maximum size of 64 KB. If the application requires binary or messages exceeding the length, it is best to use Amazon S3 or RDS and use SQS to store the pointer
  • Long Term storage
    • SQS stores messages for max 14 days and if application requires storage period longer than 14 days, Amazon S3 or other storage options should be preferred
  • High-speed message queuing or very short tasks
    • If the application requires a very high-speed message send and receive response from a single producer or consumer, use of Amazon DynamoDB or a message-queuing system hosted on Amazon EC2 may be more appropriate.

Performance

  • is a distributed queuing system that is optimized for horizontal scalability, not for single-threaded sending or receiving speeds.
  • A single client can send or receive Amazon SQS messages at a rate of about 5 to 50 messages per second. Higher receive performance can be achieved by requesting multiple messages (up to 10) in a single call.

Durability & Availability

  • are highly durable but temporary.
  • stores all messages redundantly across multiple servers and data centers.
  • Message retention time is configurable on a per-queue basis, from a minimum of one minute to a maximum of 14 days.
  • Messages are retained in a queue until they are explicitly deleted, or until they are automatically deleted upon expiration of the retention time.

Cost Model

  • pricing is based on
    • number of requests and
    • the amount of data transferred in and out (priced per GB per month).

Scalability & Elasticity

  • is both highly elastic and massively scalable.
  • is designed to enable a virtually unlimited number of computers to read and write a virtually unlimited number of messages at any time.
  • supports virtually unlimited numbers of queues and messages per queue for any user.

Amazon Redshift

  • is a fast, fully-managed, petabyte-scale data warehouse service that makes it simple and cost-effective to efficiently analyze all your data using your existing business intelligence tools.
  • is optimized for datasets that range from a few hundred gigabytes to a petabyte or more.
  • manages the work needed to set up, operate, and scale a data warehouse, from provisioning the infrastructure capacity to automating ongoing administrative tasks such as backups and patching.

Ideal Usage Pattern

  • is ideal for analyzing large datasets using the existing business intelligence tools
  • Common use cases include
    • Analyze global sales data for multiple products
    • Store historical stock trade data
    • Analyze ad impressions and clicks
    • Aggregate gaming data
    • Analyze social trends
    • Measure clinical quality, operation efficiency, and financial
    • performance in the health care space

Anti-Pattern

  • OLTP workloads
    • Redshift is a column-oriented database and more suited for data warehousing and analytics. If application involves online transaction processing, Amazon RDS would be a better choice.
  • Blob data
    • For Blob storage, Amazon S3 would be a better choice with metadata in other storage as RDS or DynamoDB

Performance

  • Amazon Redshift allows a very high query performance on datasets ranging in size from hundreds of gigabytes to a petabyte or more.
  • It uses columnar storage, data compression, and zone maps to reduce the amount of I/O needed to perform queries.
  • It has a massively parallel processing (MPP) architecture that parallelizes and distributes SQL operations to take advantage of all available resources.
  • Underlying hardware is designed for high performance data processing that uses local attached storage to maximize throughput.

Durability & Availability

  • Amazon Redshift stores three copies of your data—all data written to a node in your cluster is automatically replicated to other nodes within the cluster, and all data is continuously backed up to Amazon S3.
  • Snapshots are automated, incremental, and continuous and stored for a user-defined period (1-35 days)
  • Manual snapshots can be created and are retained until explicitly deleted.
  • Amazon Redshift also continuously monitors the health of the cluster and automatically re-replicates data from failed drives and replaces nodes as necessary.

Cost Model

  • has three pricing components:
    • data warehouse node hours – total number of hours run across all the compute node
    • backup storage – storage cost for automated and manual snapshots
    • data transfer
      • There is no data transfer charge for data transferred to or from Amazon Redshift outside of Amazon VPC
      • Data transfer to or from Amazon Redshift in Amazon VPC accrues standard AWS data transfer charges.

Scalability & Elasticity

  • provides push button scaling and the number of nodes can be easily scaled in the data warehouse cluster as the demand changes.
  • Redshift places the existing cluster in the read only mode, so the existing queries can continue to run, while is provisions a new cluster with chosen size and copies the data to it. Once the data is copied, it automatically redirects queries to the new cluster

AWS Storage Options – CloudFront & ElastiCache

~ Last updated on : ~ jayendrapatil

Amazon CloudFront

  • is a webservice for content delivery
  • provides low latency by caching and delivering content from a global network of edge locations located nearest to the user
  • supports both HTTP to allows static, dynamic content and Real Time Messaging Protocol (RTMP) for streaming of videos
  • optimized to work as with Amazon services like S3, ELB etc. as well as works seamlessly with any non-AWS origin server

Ideal Usage Patterns

  • is ideal for distribution of frequently accessed static content, or dynamic content or for streaming audio or video that benefits from edge delivery

Anti-Pattern

  • Infrequently accessed data
    • If the data is infrequently accessed, it would be better to serve the data from the Origin server
  • Programmatic cache invalidation
    • CloudFront supports cache invalidation, however AWS recommends using object versioning rather than programmatic cache invalidation.

Performance

  • is designed for low latency and high bandwidth delivery of content by redirecting the user to the nearest edge location in terms of latency and caching the content preventing the round trip to the origin server

Durability & Availability

  • provides high Availability by delivering content from a distributed global network of edge locations. Amazon also constantly monitors the network paths connecting Origin servers to CloudFront
  • does not provide durable storage, which is more of the responsibility of the underlying Origin server providing the content for e.g. S3

Cost Model

  • has two pricing components:
    • regional data transfer out (per GB) and
    • requests (per 10,000)

Scalability & Elasticity

  • provides seamless scalability & elasticity by automatically responding to the increase or the decrease in the demand

ElastiCache

  • is a webservice that makes it easy to deploy, operate, and scale a distributed, in-memory cache in the cloud
  • helps improves performance of the applications by allowing retrieval of data from fast, managed, in-memory caching system
  • supports Memcached (object caching) & Redis (key value store that supports data structure) open source caching engines

Ideal Usage Patterns

  • improving application performance by storing critical data in-memory for low latency access
  • use cases involve usage as a database front end for read heavy applications, improving performance and reducing load on databases, or managing user session data, cache dynamically generated pages, or compute intensive calculations etc.

Anti-Patterns

  • Persistent Data
    • If the application needs fast access to data coupled with strong data durability, Amazon DynamoDB would be a better option

Performance

  • Although ElastiCache provides low latency access to the data, the performance depends on the caching strategy and the hit ratio at the application level

Durability & Availability

  • stores transient data or transient copies of durable data, so the data durability is managed by the source
  • With the Memcached engine
    • all ElastiCache nodes in a single cache cluster are provisioned in a single Availability Zone.
    • ElastiCache automatically monitors the health of your cache nodes and replaces them in the event of network partitioning, host hardware, or software failure.
    • In the event of cache node failure, the cluster remains available, but performance may be reduced due to time needed to repopulate the cache in the new “cold” cache nodes.
    • To provide enhanced fault-tolerance for Availability Zone failures or cold-cache effects, you can run redundant cache clusters in different Availability Zones.
  • With the Redis engine,
    • ElastiCache supports replication to up to five read replicas for scaling. To improve availability, you can place read replicas in other Availability Zones.
    • ElastiCache monitors the primary node, and if the node becomes unavailable, ElastiCache will repair or replace the primary node if possible, using the same DNS name.
    • If the primary cache node recovery fails or its Availability Zone is unavailable, primary node can be failed over to one of the read replicas with an API call.

Cost Model

  • has a single pricing component:
    • pricing is per cache node-hour consumed

Scalability & Elasticity

  • ElastiCache is highly scalable and elastic.
  • Cache node can be added or deleted to the cache cluster
  • Auto Discovery enables automatic discovery of Memcached cache nodes by ElastiCache Clients when the nodes are added to or removed from an ElastiCache cluster.

 

Storage Options Whitepaper – Storage Gateway – Import/Export – AWS Certification

~ Last updated on : ~ jayendrapatil ~ 8 Comments

AWS Storage Options Whitepaper cont.

Provides a brief summary for the Ideal Use cases and Anti-Patterns for Storage Gateway and Import/Export AWS storage options

AWS Storage Gateway

  • Storage Gateway is a service that connects an on-premises software appliance with cloud-based storage to provide seamless and secure integration between the organization’s on-premises IT environment and AWS’s storage infrastructure.
  • Storage Gateway enables store data securely to the AWS cloud for scalable and cost-effective storage.
  • It provides low-latency performance by maintaining frequently accessed data on-premises while securely storing all of your data encrypted in S3.
  • For disaster recovery scenarios, it can serve as a cloud-hosted solution, together with EC2, that mirrors your entire production environment.
  • Storage Gateway can be configured as
    • Gateway-cached volumes
      • Gateway-cached volumes utilizes S3 for primary data backup, while retaining frequently accessed data locally in a cache.
      • These volumes minimize the need to scale the on-premises storage infrastructure, while still providing applications with low-latency access to their frequently accessed data.
      • Data written to the volumes is stored in S3, with only a cache of recently written and recently read data is stored locally on the on-premises storage hardware.
    • Gateway-stored volumes
      • Gateway-stored volumes stores the complete primary data locally, while asynchronously backing up that data to AWS.
      • These volumes provide the on-premises applications with low-latency access to their entire datasets, while providing durable, off-site backups.
      • Data written to the gateway-stored volumes is stored on the on-premises storage hardware, and asynchronously backed up to S3 in the form of EBS snapshots.

Ideal Usage Patterns

  • AWS Storage Gateway use cases include
    • corporate file sharing,
    • enabling existing on-premises backup applications to store primary backups on S3,
    • disaster recovery, and
    • data mirroring to cloud-based compute resources.

Anti-Patterns

  • Database storage
    • For Database backup or storage, EC2 instances using EBS volumes are a natural choice for database storage and workloads.

Performance

  • As the Storage Gateway VM sits between the application, underlying on-premises storage and S3, the performance experienced will be dependent upon a number of factors, including the speed and configuration of the underlying local disks, the network bandwidth between the iSCSI initiator and gateway VM, the amount of local storage allocated to the gateway VM, and the bandwidth between the gateway VM and S3.
  • For gateway-cached volumes, to provide low-latency read access to the on-premises applications, it’s important to provide enough local cache storage to store the recently accessed data.
  • Storage Gateway efficiently uses the Internet bandwidth to speed up the upload of on-premises application data to AWS.
  • Storage Gateway only uploads incremental changes (data that has changed), which minimizes the amount of data sent over the Internet.
  • AWS Direct Connect can be used to further increase throughput and reduce the network costs by establishing a dedicated network connection between the on-premises gateway and AWS.

Durability and Availability

  • AWS Storage Gateway durably stores on-premises application data by uploading it to S3.
  • S3 stores data in multiple facilities and on multiple devices within each facility.
  • S3 also performs regular, systematic data integrity checks and is built to be automatically self-healing.

Cost Model

  • AWS Storage Gateway has four pricing components:
    • gateway usage (per gateway per month),
    • snapshot storage usage (per GB per month),
    • volume storage usage (per GB per month), and
    • data transfer out (per GB per month).

Scalability and Elasticity

  • AWS Storage Gateway stores data in Amazon S3, which has been designed to offer a very high level of scalability and elasticity automatically.

Interfaces

  • AWS Management Console can be used to download the AWS Storage Gateway VM image, select between a gateway-cached or gateway-stored configuration, activate the on-premises by associating the gateway’s IP Address with your AWS account, select an AWS region, and create AWS Storage Gateway volumes and attach these volumes as iSCSI devices to your on-premises application servers.

AWS Import/Export (Upgraded to Snowball)

  • AWS Import/Export accelerates moving large amounts of data into and out of AWS using portable storage devices for transport.
  • AWS transfers the data directly onto and off of storage devices using Amazon’s high-speed internal network and bypassing the Internet and can be much faster and more cost effective than upgrading connectivity.
  • AWS Import/Export supports importing into several types of AWS storage, including EBS snapshots, S3 buckets, and Glacier vaults and exporting data from S3.

Ideal Usage Patterns

  • AWS Import/Export is ideal for transferring large amounts of data in and out of the AWS cloud, especially in cases where transferring the data over the Internet would be too slow (a week or more) or too costly.
  • Common use cases include
    • initial data upload to AWS,
    • content distribution or regular data interchange to/from your customers or business associates,
    • transfer to Amazon S3 or Amazon Glacier for off-site backup and archival storage, and quick retrieval of large backups from Amazon S3 or Amazon Glacier for disaster recovery.

Anti-Patterns

  • AWS Import/Export may not be the ideal solution for data that is more easily transferred over the Internet in less than one week.

Performance

  • Each AWS Import/Export station is capable of loading data at over 100 MB per second
  • Rate of the data load will be bounded by a combination of the read or write speed of the portable storage device and, for Amazon S3 data loads, the average object (file) size.

Durability and Availability

  • Durability and availability characteristics of the target storage i.e. EBS, S3 or Glacier applies, after the data has been imported

Cost Model

  • AWS Import/Export has three pricing components: a per-device fee, a data load time charge (per data-loading-hour), and possible return shipping charges (for expedited shipping, or shipping to destinations not local to that AWS Import/Export region).
  • Storage pricing applies for the destination storage, the standard Amazon EBS snapshot, Amazon S3, and Amazon Glacier request and storage pricing applies.

Scalability and Elasticity

  • Total amount of data you can load using AWS Import/Export is limited only by the capacity of the devices sent to AWS.
  • For Amazon S3, individual files will be loaded as objects in Amazon S3, and may range up to 5 terabytes in size.
  • For Amazon Glacier, individual devices will be loaded as a single archive, and may range up to 4 terabytes in size.
  • Aggregate total amount of data that can be imported is virtually unlimited.

Interfaces

  • To upload or download data, AWS Import/Export job for each storage device shipped need to be created and submitted
  • Jobs can be created using AWS CLI, AWS SDK or native REST API
  • Each job request requires a manifest file, a YAML-formatted text file that contains a set of key-value pairs that supply the required information—such as your device ID, secret access key, and return address—necessary to complete the job.
  • Job request is tied to the storage device through a signature file in the root directory (for Amazon S3 import jobs), or by a barcode taped to the device (for Amazon EBS and Amazon Glacier jobs).

AWS Certification Exam Practice Questions

  • Questions are collected from Internet and the answers are marked as per my knowledge and understanding (which might differ with yours).
  • AWS services are updated everyday and both the answers and questions might be outdated soon, so research accordingly.
  • AWS exam questions are not updated to keep up the pace with AWS updates, so even if the underlying feature has changed the question might not be updated
  • Open to further feedback, discussion and correction.
  1. You are working with a customer who has 10 TB of archival data that they want to migrate to Amazon Glacier. The customer has a 1-Mbps connection to the Internet. Which service or feature provides the fastest method of getting the data into Amazon Glacier?
    1. Amazon Glacier multipart upload
    2. AWS Storage Gateway
    3. VM Import/Export
    4. AWS Import/Export

AWS Storage Options – RDS, DynamoDB & Database on EC2

~ Last updated on : ~ jayendrapatil ~ 17 Comments

AWS Storage Options Whitepaper with RDS, DynamoDB & Database on EC2 Cont.

Provides a brief summary for the Ideal Use cases, Anti-Patterns and other factors for Amazon RDS, DynamoDB & Databases on EC2 storage options

Amazon RDS

  • RDS is a web service that provides the capabilities of MySQL, Oracle, MariaDB, Postgres or Microsoft SQL Server relational database as a managed, cloud-based service
  • RDS eliminates much of the administrative overhead associated with launching, managing, and scaling your own relational database on Amazon EC2 or in another computing environment.

Ideal Usage Patterns

  • RDS is a great solution for cloud-based fully-managed relational database
  • RDS is also optimal for new applications with structured data that requires more sophisticated querying and joining capabilities than that provided by Amazon’s NoSQL database offering, DynamoDB.
  • RDS provides full compatibility with the databases supported and direct access to native database engines, code and libraries and is ideal for existing applications that rely on these databases

Anti-Patterns

  • Index and query-focused data
    • If the applications don’t require advanced features such as joins and complex transactions and is more oriented toward indexing and querying data, DynamoDB would be more appropriate for this needs
  • Numerous BLOBs
    • If the application makes heavy use of files (audio files, videos, images, etc), it is a better choice to use S3 to store the objects instead of database engines Blob feature and use RDS or DynamoDB only to save the metadata
  • Automated scalability
    • RDS provides pushbutton scaling and it only scales up and has limited scale out ability. If fully-automated scaling is needed, DynamoDB may be a better choice.
  • Complete control
    • RDS does not provide admin access and does not enable the full feature set of the database engines.
    • So if the application requires complete, OS-level control of the database server with full root or admin login privileges, a self-managed database on EC2 may be a better match.
  • Other database platforms
    • RDS, at this time, provides a MySQL, Oracle, MariaDB, PostgreSQL and SQL Server databases.
    • If any other database platform (such as IBM DB2, Informix, or Sybase) is needed, it should be deployed on a self-managed database on an EC2 instance by using a relational database AMI, or by installing database software on an EC2 instance.

Performance

  • RDS Provisioned IOPS, where the IOPS can be specified when the instance is launched and is guaranteed over the life of the instance, provides a high-performance storage option designed to deliver fast, predictable, and consistent performance for I/O intensive transactional database workload

Durability and Availability

  • RDS leverages Amazon EBS volumes as its data store
  • RDS provides database backups, for enhanced durability, which are replicated across multiple AZ’s
    • Automated backups
      • If enabled, RDS will automatically perform a full daily backup of your data during the specified backup window, and will also capture DB transaction logs
    • User initiated backups
      • User can initiate backups at time and they are not deleted unless deleted explicitly by the user
  • RDS Multi AZ’s feature enhances both the durability and the availability of the database by synchronously replicating the data between a primary RDS DB instance and a standby instance in another Availability Zone, which prevents data loss,
  • RDS provides a DNS endpoint and in case of an failure on the primary, it automatically fails over to the standby instance
  • RDS also allows Read replicas for the supported databases, which are replicated asynchronously

Cost Model

  • RDS offers a tiered pricing structure, based on the size of the database instance, the deployment type (Single-AZ/Multi-AZ), and the AWS region.
  • Pricing for RDS is based on several factors: the DB instance hours (per hour), the amount of provisioned database storage (per GB-month and per million I/O requests), additional backup storage (per GB-month), and data transfer in/out (per GB per month)

Scalability and Elasticity

  • RDS resources can be scaled elastically in several dimensions: database storage size, database storage IOPS rate, database instance compute capacity, and the number of read replicas
  • RDS supports “pushbutton scaling” of both database storage and compute resources. Additional storage can either be added immediately or during the next maintenance cycle
  • RDS for MySQL also enables you to scale out beyond the capacity of a single database deployment for read-heavy database workloads by creating one or more read replicas.
  • Multiple RDS instances can also be configured to leverage database partitioning or sharding to spread the workload over multiple DB instances, achieving even greater database scalability and elasticity.

Interfaces

  • RDS APIs and the AWS Management Console provide a management interface that allows you to create, delete, modify, and terminate RDS DB instances; to create DB snapshots; and to perform point-in-time restores
  • There is no AWS data API for Amazon RDS.
  • Once a database is created, RDS provides a DNS endpoint for the database which can be used to connect to the database.
  • Endpoint does not change over the lifetime of the instance even during the failover in case of Multi-AZ configuration

Amazon DynamoDB

  • Amazon DynamoDB is a fast, fully-managed NoSQL database service that makes it simple and cost-effective to store and retrieve any amount of data, and serve any level of request traffic.
  • DynamoDB being a managed service helps offload the administrative burden of operating and scaling a highly-available distributed database cluster.
  • DynamoDB helps meet the latency and throughput requirements of highly demanding applications by providing extremely fast and predictable performance with seamless throughput and storage scalability.
  • DynamoDB provides both eventually-consistent reads (by default), and strongly-consistent reads (optional), as well as implicit item-level transactions for item put, update, delete, conditional operations, and increment/decrement.
  • Amazon DynamoDB handles the data as below :-
    • DynamoDB stores structured data in tables, indexed by primary key, and allows low-latency read and write access to items.
    • DynamoDB supports three data types: number, string, and binary, in both scalar and multi-valued sets.
    • Tables do not have a fixed schema, so each data item can have a different number of attributes.
    • Primary key can either be a single-attribute hash key or a composite hash-range key.
    • Local secondary indexes provide additional flexibility for querying against attributes other than the primary key.

Ideal Usage Patterns

  • DynamoDB is ideal for existing or new applications that need a flexible NoSQL database with low read and write latencies, and the ability to scale storage and throughput up or down as needed without code changes or downtime.
  • Use cases require a highly available and scalable database because downtime or performance degradation has an immediate negative impact on an organization’s business. for e.g. mobile apps, gaming, digital ad serving, live voting and audience interaction for live events, sensor networks, log ingestion, access control for web-based content, metadata storage for S3 objects, e-commerce shopping carts, and web session management

Anti-Patterns

  • Structured data with Join and/or Complex Transactions
    • If the application uses structured data and required joins, complex transactions or other relationship infrastructure provided by traditional database platforms, it is better to use RDS or Database installed on an EC2 instance
  • Large Blob data
    • If the application uses large blob data for e.g. media, files, videos etc., it is better to use S3 to store the objects and use DynamoDB to store metadata for e.g. name, size, content-type etc
  • Large Objects with Low I/O rate
    • DynamoDB uses SSD drives and is optimized for workloads with a high I/O rate per GB stored. If the applications stores very large amounts of data that are infrequently accessed, S3 might be a better choice
  • Prewritten application with databases
    • For Porting an existing application using databases, RDS or database installed on the EC2 instance would be a better and seamless solution

Performance

  • SSDs and limited indexing on attributes provides high throughput and low latency and drastically reduces the cost of read and write operations.
  • Predictable performance can be achieved by defining the provisioned throughput capacity required for a given table.
  • DynamoDB handles the provisioning of resources to achieve the requested throughput rate, taking away the burden to think about instances, hardware, memory, and other factors that can affect an application’s throughput rate.
  • Provisioned throughput capacity reservations are elastic and can be increased or decreased on demand.

Durability and Availability

  • DynamoDB has built-in fault tolerance that automatically and synchronously replicates data across three AZ’s in a region for high availability and to help protect data against individual machine, or even facility failures.

Cost Model

  • DynamoDB has three pricing components: provisioned throughput capacity (per hour), indexed data storage (per GB per month), data transfer in or out (per GB per month)

Scalability and Elasticity

  • DynamoDB is both highly-scalable and elastic.
  • DynamoDB provides unlimited storage capacity, and the service automatically allocates more storage as the demand increases
  • Data is automatically partitioned and re-partitioned as needed, while the use of SSDs provides predictable low-latency response times at any scale.
  • DynamoDB is also elastic, in that you can simply “dial-up” or “dial-down” the read and write capacity of a table as your needs change.

Interfaces

  • DynamoDB provides a low-level REST API, as well as higher-level SDKs in different languages
  • APIs provide both a management and data interface for Amazon DynamoDB, that enable table management (creating, listing, deleting, and obtaining metadata) and working with attributes (getting, writing, and deleting attributes; query using an index, and full scan).

Databases on EC2

  • EC2 with EBS volumes allows hosting a self managed relational database
  • Ready to use, prebuilt AMIs are also available from leading database solutions

Ideal Usage Patterns

  • Self managed database on EC2 is an ideal scenario for users whose application requires a specific traditional relational database not supported by Amazon RDS for e.g. IBM DB2, Informix, or Sybase
  • Users or applications that require a maximum level of administrative control and configurability which is not provided by RDS

Anti-Patterns

  • Index and query-focused data
    • If the applications don’t require advanced features such as joins and complex transactions and is more oriented toward indexing and querying data, DynamoDB would be more appropriate for this needs
  • Numerous BLOBs
    • If the application makes heavy use of files (audio files, videos, images, and so on), it is a better choice to use S3 to store the objects instead of database engines Blob feature and use RDS or DynamoDB only to save the metadata
  • Automated scalability
    • Relational databases on EC2 leverages the scalability and elasticity of the underlying AWS platform, but this requires system administrators or DBAs to perform a manual or scripted task. If you need pushbutton scaling or fully-automated scaling, DynamoDB or RDS may be a better choice.
  • RDS supported database platforms
    • If the application using RDS supported database engine and all the features are available, RDS would be a better choice instead of self managed relational database on EC2

Performance

  • Performance depends on the size of the underlying EC2 instance, the number and configuration of the EBS volumes and the database itself
  • Performance can be increased by scaling up memory and compute resources by choosing a larger Amazon EC2 instance size.
  • For database storage, it is usually best to use EBS Provisioned IOPS volumes. To scale up I/O performance, the Provisioned IOPS can be increased, the number of EBS volumes changed, or use software RAID 0 (disk striping) across multiple EBS volumes, which will aggregate total IOPS and bandwidth.

Durability & Availability

  • As the database on EC2 uses EBS as storage, it has the same durability and availability provided by EBS and can be further enhanced by using EBS snapshots or by using third-party database backup utilities (such as Oracle’s RMAN) to store database backups in Amazon S3

Cost Model

  • Cost for running a database on EC2 instance is mainly determined by the size and the number of EC2 instance running, the size of the EBS volume used for database storage and any third party licensing cost for the database

Scalability & Elasticity

  • Users of traditional relational database solutions on Amazon EC2 can take advantage of the scalability and elasticity of the underlying AWS platform by creating AMI and spawning multiple instances

AWS Certification Exam Practice Questions

  • Questions are collected from Internet and the answers are marked as per my knowledge and understanding (which might differ with yours).
  • AWS services are updated everyday and both the answers and questions might be outdated soon, so research accordingly.
  • AWS exam questions are not updated to keep up the pace with AWS updates, so even if the underlying feature has changed the question might not be updated
  • Open to further feedback, discussion and correction.
  1. Which of the following are use cases for Amazon DynamoDB? Choose 3 answers
    1. Storing BLOB data.
    2. Managing web sessions
    3. Storing JSON documents
    4. Storing metadata for Amazon S3 objects
    5. Running relational joins and complex updates.
    6. Storing large amounts of infrequently accessed data.
  2. A client application requires operating system privileges on a relational database server. What is an appropriate configuration for highly available database architecture?
    1. A standalone Amazon EC2 instance
    2. Amazon RDS in a Multi-AZ configuration
    3. Amazon EC2 instances in a replication configuration utilizing a single Availability Zone
    4. Amazon EC2 instances in a replication configuration utilizing two different Availability Zones
  3. You are developing a new mobile application and are considering storing user preferences in AWS, which would provide a more uniform cross-device experience to users using multiple mobile devices to access the application. The preference data for each user is estimated to be 50KB in size. Additionally 5 million customers are expected to use the application on a regular basis. The solution needs to be cost-effective, highly available, scalable and secure, how would you design a solution to meet the above requirements?
    1. Setup an RDS MySQL instance in 2 availability zones to store the user preference data. Deploy a public facing application on a server in front of the database to manage security and access credentials
    2. Setup a DynamoDB table with an item for each user having the necessary attributes to hold the user preferences. The mobile application will query the user preferences directly from the DynamoDB table. Utilize STS. Web Identity Federation, and DynamoDB Fine Grained Access Control to authenticate and authorize access (DynamoDB provides high availability as it synchronously replicates data across three facilities within an AWS Region and scalability as it is designed to scale its provisioned throughput up or down while still remaining available. Also suitable for storing user preference data)
    3. Setup an RDS MySQL instance with multiple read replicas in 2 availability zones to store the user preference data .The mobile application will query the user preferences from the read replicas. Leverage the MySQL user management and access privilege system to manage security and access credentials.
    4. Store the user preference data in S3 Setup a DynamoDB table with an item for each user and an item attribute pointing to the user’ S3 object. The mobile application will retrieve the S3 URL from DynamoDB and then access the S3 object directly utilize STS, Web identity Federation, and S3 ACLs to authenticate and authorize access.
  4. A customer is running an application in US-West (Northern California) region and wants to setup disaster recovery failover to the Asian Pacific (Singapore) region. The customer is interested in achieving a low Recovery Point Objective (RPO) for an Amazon RDS multi-AZ MySQL database instance. Which approach is best suited to this need?
    1. Synchronous replication
    2. Asynchronous replication
    3. Route53 health checks
    4. Copying of RDS incremental snapshots
  5. You are designing a file -sharing service. This service will have millions of files in it. Revenue for the service will come from fees based on how much storage a user is using. You also want to store metadata on each file, such as title, description and whether the object is public or private. How do you achieve all of these goals in a way that is economical and can scale to millions of users?
    1. Store all files in Amazon Simple Storage Service (53). Create a bucket for each user. Store metadata in the filename of each object, and access it with LIST commands against the S3 API.
    2. Store all files in Amazon 53. Create Amazon DynamoDB tables for the corresponding key -value pairs on the associated metadata, when objects are uploaded.
    3. Create a striped set of 4000 IOPS Elastic Load Balancing volumes to store the data. Use a database running in Amazon Relational Database Service (RDS) to store the metadata.
    4. Create a striped set of 4000 IOPS Elastic Load Balancing volumes to store the data. Create Amazon DynamoDB tables for the corresponding key-value pairs on the associated metadata, when objects are uploaded.
  6. Company ABCD has recently launched an online commerce site for bicycles on AWS. They have a “Product” DynamoDB table that stores details for each bicycle, such as, manufacturer, color, price, quantity and size to display in the online store. Due to customer demand, they want to include an image for each bicycle along with the existing details. Which approach below provides the least impact to provisioned throughput on the “Product” table?
    1. Serialize the image and store it in multiple DynamoDB tables
    2. Create an “Images” DynamoDB table to store the Image with a foreign key constraint to the “Product” table
    3. Add an image data type to the “Product” table to store the images in binary format
    4. Store the images in Amazon S3 and add an S3 URL pointer to the “Product” table item for each image