Top 20 AWS App Runner Questions and Answers

Without requiring you to comprehend, provision, scale, or manage any AWS compute, networking, or routing resources, App Runner easily integrates with your development workflow to deliver the appropriate amount of automation to deploy your code or container image. You have the ease of running thousands of applications that scale themselves automatically depending on your traffic requirements. Your apps run on infrastructure that is managed and run by AWS, which offers best practises for security and compliance like automatic security patches and encryption.

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Ques. 1): If I don't utilise containers, can I still use AWS App Runner?

Answer:

Yes. On curated App Runner platforms with supported runtimes and frameworks, AWS App Runner supports automatically creating a container image. App Runner automatically containersizes your web application and gives a running web application when you associate your existing source code repository and optionally provide it your runtime build and start commands.

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Ques. 2): What use cases are supported by App Runner's integration with Amazon Virtual Private Cloud (Amazon VPC)?

Answer:

Your service can access database engines like Amazon Aurora, MySQL, PostgreSQL, and MariaDB on Amazon Relational Database Service (RDS) instances that run in a VPC thanks to App Runner's support for Amazon VPC. With this support, your service can also communicate with backend services running on AWS Fargate, supported by Amazon Elastic Container Service and Amazon Elastic Kubernetes Service, or Amazon Elastic Compute Cloud in a VPC. These services include message brokers like Amazon Managed Streaming for Apache Kafka or Amazon MQ. Finally, you can also enable your service to talk to an on premise database that can be connected via an AWS Direct Connect network connection set up in a VPC.

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Ques. 3): How do applications grow with changing demand using AWS App Runner?

Answer:

Based on the volume of requests being submitted to your application concurrently, AWS App Runner automatically launches more instances. App Runner will scale the containers down to a provided instance, a CPU-throttled instance ready to service incoming requests within milliseconds, if your application receives no incoming requests. The autoscaling settings of your application allow you to optionally configure the number of concurrent requests made to an instance.

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Ques. 4): Can I use an orchestrator to execute persistent applications on AWS Fargate and web applications on AWS App Runner?

Answer:

Yes. Use AWS Fargate with an orchestrator that can handle various resources, like as graphics acceleration or persistent volumes, if you need to run other applications, including content management systems that require a persistent file system or machine learning tasks. Since the Copilot CLI supports both App Runner and ECS/Fargate, you can keep using the tool if you already are. To monitor applications running across App Runner, Amazon ECS tasks running on Fargate, and Amazon EKS pods running on Fargate, you can also use Amazon CloudWatch as your single point of access.

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Ques. 5): What makes AWS App Runner so great?

Answer:

AWS App Runner is the simplest method to execute your online applications on AWS, including webpages, API services, and backend web services. No infrastructure or container orchestration is necessary with App Runner. You may quickly transition to a fully operational containerized web application on AWS using an existing container image, container registry, source code repository, or existing CI/CD workflow.

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Ques. 6): What kind of options do I have for deployment using AWS App Runner?

Answer:

AWS App Runner offers a variety of deployment options, including the capacity to instantly deploy a container image using the App Runner dashboard or AWS CLI. You may quickly add App Runner as your deployment target using the App Runner API or AWS CLI if you already have a CI/CD workflow in place that utilises AWS CodePipeline, Jenkins, Travis CI, CircleCI, or another CI/CD toolchain. You may easily connect to your current container registry or source code repository and have App Runner automatically create a continuous deployment pipeline for you if you want it to perform automatic continuous deployment on your behalf.

With App Runner, you can create a distinct application for each of your container images or source code branches, complete with its own build and start instructions, environment variables, and deployment category (such as development or production). All the advantages of hosting your web application on App Runner, such as default security, seamless scaling, and monitoring, are yours once it has been deployed.

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Ques. 7): How would I gain access to storage, databases, or cache services if my application required it?

Answer:

You can link an application to alternative storage, database, or application integration services without being limited by AWS App Runner. Customers may quickly add the required code and connection instructions to their applications or containers, and then setup their applications so that they can safely communicate with these external services across the network.

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Ques. 8): What are the budget controls for AWS App Runner?

Answer:

To prevent expenditures from going over your budget, you can put a maximum restriction on the number of active container instances your application utilises.

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Ques. 9): How can I get AWS App Runner up and running?

Answer:

By going to the App Runner console or using the AWS CLI and building an App Runner application, you can deploy an AWS App Runner application on AWS. You can give a container image, connect your source code repository or container registry, and specify any optional build and start commands when constructing the App Runner application. A secure URL will be generated for the service automatically by App Runner.

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Ques. 10): How can I access the logs for my AWS App Runner-based application?

Answer:

AWS App Runner offers runtime logs and deployment logs that are gathered from the output streams of all system components, web frameworks, runtimes, build and deployment instructions, and application/web servers. This integration with Amazon CloudWatch Logs is complete. These are combined by App Runner into a single thorough channel that is accessible via the App Runner console, CloudWatch console, and AWS CLI.

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Ques. 11): Do I have to pay to access the VPC on App Runner?

Answer:

No. You only pay for data transmission expenses; for instance, if your App Runner application and your Amazon Relational Database Service instances are located in different Availability Zones, you will pay for the communication between them.

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Ques. 12): Should I require additional flexibility, can I switch from AWS App Runner to Amazon Elastic Container Service (Amazon ECS), Amazon Elastic Kubernetes Service (Amazon EKS), or another AWS service?

Answer:

Yes. On Amazon ECS or Amazon EKS, you can utilise the same container image that was deployed to App Runner. As your needs change, you have the flexibility to switch to new services. Using the tools and onboarding process offered by the new AWS service you select, you can deploy your code or containers directly to it.

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Ques. 13): How is AWS App Runner priced?

Answer:

The computation and memory resources used by your programme are charged to you. You can also pay for extra App Runner services like automating your deployments or generating your deployment from source code.

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Ques. 14): What kinds of programmes can I use AWS App Runner for?

Answer:

AWS App Runner facilitates full stack development, including frontend and backend HTTP and HTTPS web applications. Websites, backend web services, and API services are examples of these applications. Container images, runtimes, and web frameworks like Node.js and Python are all supported by App Runner.

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Ques. 15): Can I pass a VPC ID, subnets, or security groups when creating an App Runner application?

Answer:

Yes. Using this data, network interfaces that enable communication with a VPC will be built. App Runner will build numerous network interfaces—one for each subnet—if you pass it multiple subnets. We recommend that you specify at least two subnets for improved availability.

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Ques. 16): Can I run web applications on AWS App Runner using my own domain name?

Answer:

Using the App Runner GUI or AWS CLI, you can easily add your custom domain to your AWS App Runner application. App Runner gives you steps to help you update your DNS records with your DNS provider when you add your own domain name. Custom root domains (example.com), custom subdomains (www.example.com), and wildcard domains (*.example.com) are all supported by App Runner.

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Ques. 17): Does Copilot offer support for AWS App Runner?

Answer:

AWS Customers may simply launch and maintain containerized applications on AWS using Copilot's command line interface (CLI). Utilizing Copilot will allow you to launch AWS App Runner rapidly. Additionally, you can utilise Copilot as your default CLI to manage AppRunner, ECS, and/or Fargate.

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November 16, 2022

Top 20 AWS ElastiCache Interview Questions and Answers

Web services like Amazon ElastiCache make it simple to set up and manage Memcached or Redis protocol-compliant server nodes in the cloud. With Amazon ElastiCache, you may get data from a quick, controlled, in-memory system rather than only relying on slower disk-based databases, which increases the speed of web applications. Your engineering resources may concentrate on creating applications as a result of the service's simplification and offloading of in-memory environment administration, monitoring, and operation. You may use Amazon ElastiCache to decrease the cost of scaling online applications while also enhancing load and response times to user actions and queries.

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Ques: 1). What is Amazon ElastiCache?

Answer:

Common administrative activities needed to run a distributed in-memory key-value environment are automated by Amazon ElastiCache. With a few clicks on the AWS Management Console, you can quickly add a caching or in-memory layer using Amazon ElastiCache to your application design. A robust solution that reduces the danger of overcrowded databases, which degrade website and application load times, is provided by Amazon ElastiCache after a cluster is established. This technology automatically identifies and replaces failing nodes. The integration of Amazon ElastiCache with Amazon CloudWatch monitoring improves insight into the crucial performance indicators related to your nodes. Because Memcached and Redis are protocol-compliant, you may use the same code, programmes, and well-known tools you already use with your current Memcached or Redis installations with Amazon ElastiCache. With Amazon ElastiCache's support for clustered configuration, you can take advantage of a managed service that is quick, scalable, and simple to use while still being able to handle the demands of your most demanding applications. There are no upfront costs involved, and you just pay for the resources you use, like with other Amazon Web Services.

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Ques: 2). What are the nodes, shards, and clusters of Amazon ElastiCache?

Answer:

The smallest component of an Amazon ElastiCache setup is a node. It is a fixed-size portion of safely connected network RAM. Each node has its own DNS name, port, and instance of the Memcached or Redis protocol-compliant service. There are several different types of supported nodes, each with a different amount of memory. A Redis shard is a portion of the cluster's keyspace, which may consist of a primary node and 0–n read replicas.

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Ques: 3). What is handled on my behalf by Amazon ElastiCache?

Answer:

The setup of a distributed in-memory environment is handled by Amazon ElastiCache, which also handles the provisioning of the server resources and software installation. The solution automates routine administrative chores like failure detection and recovery and software patching once your environment is operational. You may rapidly identify problems by using the precise monitoring metrics that Amazon ElastiCache offers for your nodes. For instance, if one of your nodes becomes overwhelmed with requests, you may set up thresholds and get alarms.

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Ques: 4). Amazon ElastiCache Reserved Nodes: What are they?

Answer:

When you commit to a one-year or three-year term, reserved nodes or reserved instances (RI) provide you a considerable discount over on-demand use. With Reserved Nodes, you may make a one-time, upfront payment to create a one- or three-year reservation to run your node in a certain Region and save a lot of money compared to the regular hourly usage fee. You may balance the upfront payment with your hourly rate by choosing one of three Reserved Node types: All Upfront, No Upfront, or Partial Upfront.

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Ques: 5). A maintenance window is what? My nodes will be accessible during software maintenance, right?

Answer:

You might consider the Amazon ElastiCache maintenance window as a chance to decide when software patches are applied, should that be requested or necessary. If a "maintenance" event is planned for a specific week, it will start and end at the designated 60-minute maintenance window.

If software patching is planned during your maintenance window, your nodes can experience some outage. For further information, please see Engine Version Management. Patching may be requested by the user, such as when upgrading the cache software, or it may be deemed necessary (if we identify any security vulnerabilities in the system or caching software). Software patches should seldom take up more than a small portion of your maintenance window as they are applied infrequently (usually once every few months). A default value of 60 minutes is applied if you do not provide a desired weekly maintenance window when configuring your Cluster. By updating your DB Instance in the AWS Management Console or by using the ModifyCacheCluster API, you may change when maintenance is carried out on your behalf. If you like, each of your Clusters may have a distinct preferred maintenance window.

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Ques: 6). Why do I need a subnet group and what does it accomplish?

Answer:

For your Amazon ElastiCache Cluster in a VPC, you must specify a Subnet Group, which is a group of subnets. With the help of the Amazon ElastiCache Console, a Subnet Group is formed. There should be at least one subnet in each subnet group. The Subnet Group is used by Amazon ElastiCache to choose a subnet. The Node Endpoints are next connected to the IP Addresses from the chosen subnet. In addition, nodes with the aforementioned IP addresses are connected to via Elastic Network Interfaces that Amazon ElastiCache builds.

Because the underlying IP addresses for your nodes might vary, Amazon highly advises using the DNS Names to connect to them (e.g., after cache node replacement).

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Ques: 7). When does the contract for a Reserved Node start if I sign up for one? What occurs to my node at the conclusion of the term?

Answer:

When your request is accepted, the pricing adjustments related to a Reserved Node are triggered while the payment authorization is being handled. On the AWS Account Activity page or by using the DescribeReservedCacheNodes API, you may monitor the progress of your reservation. The discounted pricing will not apply if the one-time payment cannot be authorised by the end of the subsequent billing cycle.

Your Reserved Node will go back to the appropriate On-Demand hourly use charge for your node class and location after your reservation period expires.

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Ques: 8). How do I pick my Cluster's configuration settings correctly?

Answer:

By default, Amazon ElastiCache selects the cluster's ideal configuration settings based on the Node Type's memory and compute resource availability. However, you can modify them if necessary by utilising our configuration management APIs. Please be aware that altering configuration settings from suggested values might result in unanticipated consequences such as performance degradation or system failures and should only be done by experienced users who are willing to take these risks.

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Ques: 9). Today, I employ Memcached. Why should I switch to Amazon ElastiCache?

Answer:

Memcached and Amazon ElastiCache both adhere to the same protocol. As a result, you may utilise common Memcached operations like get, set, incr, and decr precisely as you would in your current Memcached installations. The text and binary protocols may both be used with Amazon ElastiCache. Additionally, it supports the most of the common statistic results, which are also available via CloudWatch as graphs. Because the libraries you use will still function, you may switch to utilising Amazon ElastiCache without recompiling or re-linking your apps. You only need to edit your application's Memcached configuration file to include the endpoints of the servers (nodes) we supply for you in order to setup the cache servers your application visits. To retrieve a list of the endpoints, you can just use the "DescribeCacheClusters" API or the "Copy Node Endpoints" option on the AWS Management Console. Before completing the switchover from your current solution, Amazon advises extensive testing of your new Amazon ElastiCache setup, as with any migration procedure.

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Ques: 10). A cluster may potentially cover more than one Availability Zone, is it true?

Answer:

Yes. You can select the availability zones for the new nodes while building a cluster or adding nodes to an existing cluster. Either choose "spread nodes across zones" or enter the desired number of nodes in each availability zone. Nodes can only be deployed in availability zones that are a part of the chosen cache subnet group if the cluster is in a VPC.

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Ques: 11). How do other Amazon Web Services and Amazon ElastiCache interact?

Answer:

As a front-end for Amazon Web Services like Amazon RDS and Amazon DynamoDB, Amazon ElastiCache is perfectly suited since it offers exceptionally low latency for high speed applications and offloads some of the request traffic while these services guarantee long-lasting data durability. Along with Amazon EC2 and EMR, the service may also be leveraged to enhance application performance.

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Ques: 12). What are the steps for utilising Auto Discovery?

Answer:

Click the "Download ElastiCache Cluster Client" link on the Amazon ElastiCache interface to begin downloading the Amazon ElastiCache Cluster Client. You need an Amazon ElastiCache account before you can download; if you don't currently have one, you may create one from the Amazon ElastiCache information page. By going to the Amazon ElastiCache console after downloading the client, you can start configuring and activating your Amazon ElastiCache cluster.

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Ques: 13). How can I tell my cluster to run the supported version of Memcached?

Answer:

When constructing a new cluster, you can choose any minor or major version that is currently supported. Using the "Modify" option for your cluster, you can start an upgrade to a supported engine version release. Simply enter the desired version into the "Cache Engine Version" column. If the "Applied Immediately" option is selected, the update will then be carried out on your behalf either right away or during the subsequent cluster maintenance session.

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Ques: 14). How can in-memory caching benefit my applications?

Answer:

With the help of Amazon ElastiCache's in-memory caching, many read-heavy application workloads (including social networking, gaming, media sharing, and Q&A portals) or compute-intensive workloads can experience a considerable reduction in latency and throughput (such as a recommendation engine). By keeping important data in memory for quick access, in-memory caching enhances application performance. The outcomes of computation- or I/O-intensive calculations as well as the results of database queries may both be included in cached data.

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Ques: 15). How can I build a cluster?

Answer:

Using the AWS Management Console, Amazon ElastiCache APIs, or Command Line Tools, cluster creation is straightforward. Click the "Create" button in the "Memcached" or "Redis" tab of the AWS Management Console to start a cluster. To build a cluster with the required amount of RAM, you only need to give your Cluster Identifier, Node Type, and Number of Nodes. As an alternative, you may build your cluster using the elasticache-create-cache-cluster command or the CreateCacheCluster API. When you create a cluster, AWS will automatically deploy it in an Availability Zone depending on your memory needs and available capacity if you do not select one.

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Ques: 16). When utilising VPC is not an option, How does the Cache Security Groups in Amazon ElastiCache let you manage access to your clusters?

Answer:

A Security Group controls network access to your cluster similarly to a firewall. Your clusters' network access is disabled by default. You must explicitly permit access from hosts in particular EC2 security groups if you want your apps to be able to access your cluster. Ingress is the name of this procedure.

Create a Security Group and link it to the required EC2 security groups (which in turn define the EC2 instances authorised) to grant network access to your cluster. When creating your cluster, the Security Group can be linked to it, or you can do it later by selecting "Modify" from the AWS Management Console.

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Ques: 17). With Amazon ElastiCache for Memcached, what can I cache?

Answer:

Using the service, you can cache a wide range of objects, including transient session data that might not need a persistent backing store, dynamically generated web pages (using, for instance, Nginx), and content in persistent data stores (like Amazon RDS, DynamoDB, or self-managed databases hosted on EC2). Additionally, you may use it to install admission control in high traffic online applications by implementing high-frequency counters.

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Ques: 18). How do I control network access to my cluster?

Answer:

In non-VPC installations, Amazon ElastiCache enables you to manage access to your cluster and, therefore, the nodes, using Security Groups. A Security Group controls network access to your node similarly to a firewall. Your nodes' network access is disabled by default. You may configure your Security Group to permit access from EC2 Instances with a certain EC2 Security Group membership or IP ranges if you want your apps to have access to your node. Ingress is the name of this procedure. All nodes included in a Security Group must abide by the same rules once ingress has been set for that Security Group. The "Security Groups" section of the Amazon ElastiCache Console or the Amazon ElastiCache APIs may be used to configure security groups.

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Ques: 19). How will I be charged and billed for my use of Amazon ElastiCache?

Answer:

There is no minimum charge; you simply pay for what you really use. For each Node Type, pricing is based on utilised Node-hours. Node-hours that are utilised in part are invoiced as full hours. Within the same Availability Zone, there are no fees associated with data transmission between Amazon EC2 and Amazon ElastiCache. You are only billed for data transfers into or out of the Amazon EC2 instance, even if regular Amazon EC2 Regional Data Transfer fees apply when moving data between an Amazon EC2 instance and an Amazon ElastiCache Node in different Availability Zones of the same Region. For traffic entering or leaving the Amazon ElastiCache Node itself, there is no Amazon ElastiCache Data Transfer fee. For data transported outside of an area, standard data transfer rates apply.

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Ques: 20). Which well-known Memcached libraries work with Amazon ElastiCache?

Answer:

LibMemcached (C) and libraries based on it (e.g. PHP, Perl, Python), spyMemcached (Java), and fauna are some examples of existing Memcached client libraries that function with Amazon ElastiCache without the need to recompile or re-link applications (Memcached 1.4.5 and later) (Ruby).

November 23, 2021

Top 20 AWS Database Interview Questions and Answers

Ques: 1). What are your thoughts on the Amazon Database?

Answer:

Amazon Database is an Amazon Web Services offering that includes managed databases, managed services, and NoSQL. It also comes with a fully managed petabyte-scale data warehouse and in-memory caching as a service. There are four AWS database services to choose from, and the user can use one or all of them depending on their needs. DynamoDB, RDS, RedShift, and ElastiCache are the Amazon database services.

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Ques: 2). What are the features of Amazon Database?

Answer:

Following are the important features of Amazon Database:

Easy to administer
Highly scalable
Durable and reliable
Faster performance
Highly available
More secure
Cost-effective

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Ques: 3). What is a key-value store, and how does it work?

Answer:

A key-value store is a database service that makes it easier to store, update, and query items that are identified by their keys and values. These objects are made up of keys and values that make up the actual content that is saved.

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Ques: 4). What Is A Data Warehouse, And How Can Amazon Redshift Help With Storage?

Answer:

A data warehouse can be conceived of as a repository for data acquired and stored from the company's systems and other sources. As a result, a data warehouse's design is three-tiered:

The tools that clean and collect data are found on the bottom rung.

We have tools in the intermediate layer that use Online Analytical Processing Server to alter the data.

We have various tools on the top layer that execute data analysis and data mining on the front end.

Setting up and maintaining a data warehouse costs a lot of money, especially as an organization's data grows and its data storage servers need to be upgraded on a regular basis. As a result, AWS RedShift was created, allowing businesses to store their data in Amazon's cloud-based warehouses.

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Ques: 5). What Is The Difference Between A Leader Node And A Compute Node?

Answer:

The queries from the client application are received in a leader node, where they are parsed and an execution plan is created. The stages for processing these queries are created, and the outcome is returned to the client application.

The steps allocated in the leader node are completed in a compute node, and the data is transferred. After that, the result is returned to the leader node before being delivered to the client application.

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Ques: 6). What Is Amazon ElastiCache, and How Does It Work?

Answer:

Amazon ElastiCache is an in-memory key-value store that can handle Redis and Memcached as key-value engines. It is a fully managed and zero administration service that Amazon has hardened. You may use Amazon ElastiCache to either create a new high-performance application or upgrade an existing one. ElastiCache has a wide range of applications in gaming, healthcare, and other fields.

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Ques: 7). What Is Amazon ElastiCache's Purpose?

Answer:

The caching of information that is utilised repeatedly could increase the performance of online applications. Using in-memory-caching, the data may be accessed very quickly. There is no need to manage a separate caching server with ElastiCache. An open source compatible in-memory data source with high throughput and low latency can be readily deployed or run.

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Ques: 8). When would I prefer Provisioned IOPS over Standard RDS storage?

Answer:

Provisioned IOPS deliver high IO rates but on the other hand it is expensive as well. Batch processing workloads do not require manual intervention they enable full utilization of systems, therefore a provisioned IOPS will be preferred for batch oriented workload.

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Ques: 9). What Oracle features are available in AWS RDS?

Answer:

Oracle is a well-known relational database that is available through Amazon RDS with enterprise version features. Almost every Oracle functionality may be used with the RDS platform.

If no version is specified when the database is created, it defaults to the most recent version available at the moment. In a Python SDK programme, here's an example of how to access the supported DB Engine versions using the AWS API.

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Ques: 10). What are the differences between Amazon RDS, DynamoDB, and Redshift?

Answer:

Amazon RDS is a relational database management service that handles patching, upgrading, and data backups for you without requiring your involvement. RDS is a database management service that exclusively handles structured data.

On the other hand, DynamoDB is a NoSQL database service, which works with unstructured data.

Redshift is a data warehouse product that is utilised in data analysis and is a completely different service.

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Ques: 11). Can I use Amazon RDS to operate many database instances for free?

Answer:

Yes. You can operate many Single-AZ Micro database instances, and they're all free! Any use of more than 750 instance hours across all Amazon RDS Single-AZ Micro DB instances, across all qualifying database engines and locations, will be paid at normal Amazon RDS charges. For example, if you run two Single-AZ Micro DB instances for 400 hours each in a month, you'll have 800 instance hours total, with 750 hours being free. The remaining 50 hours will be charged at the usual Amazon RDS rate.

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Ques: 12). What is Oracle Licensing and how does it work?

Answer:

Oracle licenses can be used in RDS in two ways:

Model with a License

The license for the software you'll use is held by Amazon in this model. Also, through its support programme, AWS provides support for both AWS and Oracle products. As a result, the user does not need to purchase a separate license. The user's licensing costs are included in the platform pricing.

Bring Your Own license

In this arrangement, the user imports her license into the RDS platform. It is the user's responsibility to keep the license, database instance class, and database edition all in sync. The user directly contacts the Oracle support channel for any need. In this model the supported editions are Enterprise Edition (EE), Standard Edition (SE), Standard Edition One (SE1) and Standard Edition Two (SE2).

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Ques: 13). If I delete my DB Instance, what happens to my backups and DB Snapshots?

Answer:

When you delete a database instance, you have the option of creating a final database snapshot, which you can use to restore your database. After the instance is removed, RDS keeps this user-made DB snapshot together with all other manually created DB snapshots. Automated backups are also deleted, leaving just manually created DB Snapshots.

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Ques: 14). How can I load data into Amazon Redshift from various data sources such as Amazon RDS, Amazon DynamoDB, and Amazon EC2?

Answer:

You have two options for loading the data:

The COPY command can be used to load data into Amazon Redshift in parallel from Amazon EMR, Amazon DynamoDB, or any SSH-enabled server.

AWS Data Pipeline is a fault-tolerant, high-performance solution for loading data from a range of AWS data sources. To load your data into Amazon Redshift, you can utilise AWS Data Pipeline to specify the data source, required data transformations, and then run a pre-written import script.

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Ques: 15). What is an RDS instance, and how does it work?

Answer:

The Amazon Relational Database Service (Amazon RDS) is a web service that lets you easily construct a cloud-based relational database instance. Amazon RDS administers the database instance on your behalf, including backups, failover, and database software maintenance. Read Replicas, which are RDS instances that act as copies of the source master database for handling read-requests, can be launched for read-heavy applications. A source DB instance can have up to five (5) Read Replicas attached to it. The existing RDS Instances in the selected AWS region are listed on the Instances page. The information for an existing RDS Instance are displayed when you click on it.

Fields

Name - unique name/identifier for the RDS instance.

Engine - The version of the MySQL or Oracle engine of the RDS Instance.

RDS Subnet Group - The group of RDS Subnets for the VPC.

Availability Zone - The availability zone into which the RDS Instance will be created and launched.

Multi-AZ - Indicates that the RDS Instance will be used in a multiple availability zone configuration.

Instance class - If you selected a different instance type, the existing instance will be terminated and new RDS instance will be launched.

Storage - storage size in GBs for the instance that will be allocated for storing data.

Source instance - If the instance is a Read Replica, it will list the name of the source DB instance.

Status - The status of the RDS Instance (creating, modifying, available, rebooting, deleting). An RDS Instance will only be accessible when its status is 'available'.

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Ques: 16). What is Amazon Aurora and how does it work?

Answer:

Amazon Aurora is a form of cloud-based relational database that works with MySQL and PostgreSQL. It performs five times faster than MySQL and three times faster than PostgreSQL. The performance and availability of traditional databases are combined with the simplicity and cost-effectiveness of open-source databases in this hybrid database type. Because Amazon RDS manages this database completely, operations like hardware provisioning, database setup, patching, and backups are all automated.

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Ques: 17). Which Amazon Web Services services will you use to collect and process e-commerce data in real time for analysis?

Answer:

For real-time analysis, I'll utilise DynamoDB to collect and handle e-commerce data. DynamoDB is a fully managed NoSQL database service for unstructured data. It can even be used to extract e-commerce information from websites. RedShift may then be used to perform analysis on the retrieved e-commerce data. Elastic MapReduce can be utilised for analysis as well, but we won't use it here because real-time analysis isn't required.

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Ques: 18). What happens if a user deletes a dB instance? What happens to the dB snapshots and backups?

Answer:

The user is given the option of taking a last dB snapshot when a dB instance is removed. If you do so, your information from the snapshot will be restored. When the dB instance is removed, AWS RDS preserves all of the user-made dB snapshots together with all of the other manually created dB snapshots. Automated backups are erased at the same time, but manually produced dB snapshots are kept.

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Ques: 19). What Is A Dynamodbmapper Class And How Does It Work?

Answer:

The DynamoDB's entry point is the mapper class. It allows users to access the endpoint and input the DynamoDB. Users can use the DynamoDB mapper class to retrieve data stored in various databases, run queries, scan them against the tables, and perform CRUD activities on the data items.

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Ques: 20). What is the RDS interface, and how does it work?

Answer:

To use the RDS service, Amazon provides an RDS interface. An RDS interface is required to interact with the RDS service, such as reading data, uploading data, and running other programmes.

The GUI Console, Command Line Interface, and AWS API are the three main interfaces available.

A GUI Console is the most basic interface via which users can interact with the RDS Service.

The Command Line Interface (CLI) provides you with CLI access to the service, allowing you to run DB commands and interact with it.

An AWS API is an Application Programming Interface that allows two systems to exchange data.

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