{"id":25304,"date":"2017-05-06T18:54:40","date_gmt":"2017-05-06T18:54:40","guid":{"rendered":"https:\/\/www.whizlabs.com\/?p=25304"},"modified":"2024-05-17T15:06:03","modified_gmt":"2024-05-17T09:36:03","slug":"aws-rds-multi-az-read-replica","status":"publish","type":"post","link":"https:\/\/www.whizlabs.com\/blog\/aws-rds-multi-az-read-replica\/","title":{"rendered":"High Availability using AWS RDS Multi-AZ and Read Replica"},"content":{"rendered":"<p><span>Are you preparing for <a href=\"https:\/\/www.whizlabs.com\/aws-solutions-architect-professional\/\" title=\"AWS Certified Solutions Architect Professional\">AWS Certified Solutions Architect Professional certification exam<\/a><span>?<\/span>\u00a0In this space, we are writing series of articles on topics which are covered in the Solutions Architect Professional\u00a0certification exam. In this article, we are explaining one of the important feature available with Amazon web services which is AWS RDS Multi-AZ and Read Replica. You would expect lot of questions from this topic for Solutions Architect Professional\u00a0exam. You can subscribe to us for receiving the further updates on this topic.<\/span><\/p>\n<ul>\n<li><strong><a href=\"https:\/\/www.whizlabs.com\/aws-solutions-architect-professional\/free-test\/\"> AWS Certified Solutions Architect Professional &#8211; Free Test<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/www.whizlabs.com\/blog\/aws-certified-solutions-architect-professional\/\" title=\"HOW TO Prepare for AWS Certified Solutions Architect Professional Certification Exam?\">How to prepare for AWS certified solutions architect professional exam?<\/a><\/strong><\/li>\n<\/ul>\n<p><span>This topic addresses the High Availability and Business continuity topic mentioned in the below table and as highlighted in the AWS Blueprint for the exam guide<\/span><\/p>\n<ul>\n<li><strong><a href=\"https:\/\/d0.awsstatic.com\/training-and-certification\/docs-sa-pro\/AWS_certified_solutions_architect_professional_blueprint.pdf\" target=\"_blank\" rel=\"noopener\">https:\/\/d0.awsstatic.com\/training-and-certification\/docs-sa-pro\/AWS_certified_solutions_architect_professional_blueprint.pdf<\/a><\/strong><\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/blueprint.png\"><img decoding=\"async\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/blueprint.png\" alt=\"AWS Certified Solutions Architect Professional BluePrint\" width=\"680\" height=\"190\" class=\"aligncenter wp-image-25632 size-full\" title=\"AWS Certified Solutions Architect Professional BluePrint\" \/><\/a><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #ea7e02;color:#ea7e02\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #ea7e02;color:#ea7e02\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.whizlabs.com\/blog\/aws-rds-multi-az-read-replica\/#Purpose_of_Multi-AZ_and_Read_Replica\" >Purpose of Multi-AZ and Read Replica<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.whizlabs.com\/blog\/aws-rds-multi-az-read-replica\/#Creating_a_Multi-AZ_Database\" >Creating a Multi-AZ Database<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.whizlabs.com\/blog\/aws-rds-multi-az-read-replica\/#Creating_a_Read_Replica\" >Creating a Read Replica<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.whizlabs.com\/blog\/aws-rds-multi-az-read-replica\/#Final_Points_to_Remember_about_RDS_Multi-AZ_and_Read_Replica\" >Final Points to Remember about RDS Multi-AZ and Read Replica<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.whizlabs.com\/blog\/aws-rds-multi-az-read-replica\/#Summary\" >Summary<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Purpose_of_Multi-AZ_and_Read_Replica\"><\/span><b>Purpose of Multi-AZ and Read Replica<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>AWS provides the facility of hosting Relational databases. The following databases are supported &#8211; <a href=\"https:\/\/aws.amazon.com\/rds\/postgresql\/\" target=\"_blank\" rel=\"noopener\">PostgreSQL<\/a>,\u00a0<a href=\"https:\/\/aws.amazon.com\/rds\/mysql\/\" target=\"_blank\" rel=\"noopener\">MySQL<\/a>,\u00a0<a href=\"https:\/\/aws.amazon.com\/rds\/mariadb\/\" target=\"_blank\" rel=\"noopener\">MariaDB<\/a>,\u00a0<a href=\"https:\/\/aws.amazon.com\/rds\/oracle\/\" target=\"_blank\" rel=\"noopener\">Oracle<\/a>, and\u00a0<a href=\"https:\/\/aws.amazon.com\/rds\/sqlserver\/\" target=\"_blank\" rel=\"noopener\">Microsoft SQL Server<\/a>.<\/p>\n<p>For the databases, there are 2 features which are provided by AWS<\/p>\n<ol>\n<li>Multi-AZ \u2013 In this architecture, AWS maintains a copy of the primary database in another Availability Zone. So if a failure occurs in the primary database, an instance switch over can occur to the secondary database. The data is replicated synchronous\u00a0to the standby instance.<\/li>\n<\/ol>\n<p><a href=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/MultiAZArchitecture.png\"><img decoding=\"async\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/MultiAZArchitecture.png\" alt=\"Multi-AZ Architecture\" width=\"412\" height=\"281\" class=\"aligncenter wp-image-25380 size-full\" title=\"Multi-AZ Architecture\" \/><\/a><\/p>\n<p>The primary DB instance switches over automatically to the standby replica if any of the following conditions occur:<\/p>\n<ul>\n<li>An Availability Zone outage<\/li>\n<li>The primary DB instance fails<\/li>\n<li>The DB instance&#8217;s server type is changed<\/li>\n<li>The operating system of the DB instance is undergoing software patching<\/li>\n<li>A manual failover of the DB instance was initiated using\u00a0Reboot with failover<\/li>\n<\/ul>\n<p>When operations such as DB instance scaling or system upgrades like OS patching are initiated for Multi-AZ deployments, for enhanced availability, they are applied first on the standby prior to an automatic failover. As a result, your availability impact is limited only to the time required for automatic failover to complete. Note that Amazon RDS Multi-AZ deployments do not failover automatically in response to database operations such as long running queries, deadlocks or database corruption errors.<\/p>\n<ol start=\"2\">\n<li>Read Replica \u2013 This is where you take a snapshot of the current RDS in AWS. This is like a read only copy that can be used to increase the scalability of a database. Normally a Read replica is used to offload heavy read traffic for an application. So if you have an application that has a heavy query interface and looks for consistent number of reads, then Read replica can be used. The transactional part can exist in the main database and the reads can happen in the Read replica database.<\/li>\n<\/ol>\n<p>Read replicas are available in Amazon RDS for\u00a0<a href=\"https:\/\/aws.amazon.com\/rds\/mysql\/\" target=\"_blank\" rel=\"noopener\">MySQL<\/a>,\u00a0<a href=\"https:\/\/aws.amazon.com\/rds\/mariadb\/\" target=\"_blank\" rel=\"noopener\">MariaDB<\/a>, and\u00a0<a href=\"https:\/\/aws.amazon.com\/rds\/postgresql\/\" target=\"_blank\" rel=\"noopener\">PostgreSQL<\/a>.<\/p>\n<p>Some of the other advantages of read replica\u2019s are<\/p>\n<ul>\n<li>Enhanced security \u2013 All traffic between the source and destination database is encrypted.<\/li>\n<li>Read replicas in Amazon RDS for MySQL, MariaDB, and PostgreSQL provide a complementary availability mechanism to\u00a0<a href=\"https:\/\/aws.amazon.com\/rds\/details\/multi-az\/\" target=\"_blank\" rel=\"noopener\">Amazon RDS Multi-AZ Deployments<\/a>. You can promote a read replica if the source DB instance fails. You can also replicate DB instances across\u00a0<a href=\"https:\/\/aws.amazon.com\/about-aws\/global-infrastructure\/\" target=\"_blank\" rel=\"noopener\">AWS Regions<\/a>as part of your disaster recovery strategy.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Creating_a_Multi-AZ_Database\"><\/span>Creating a Multi-AZ Database<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Let\u2019s now look at the steps involved in creating a Multi-AZ database. For our example, we will use a MySQL database provided by AWS.<\/p>\n<p><strong>Step 1:<\/strong> After logging into the console , go to the Database-&gt;RDS section<\/p>\n<p><a href=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/Database.png\"><img decoding=\"async\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/Database.png\" alt=\"Goto Database and then select RDS\" width=\"153\" height=\"139\" class=\"aligncenter wp-image-25374 size-full\" title=\"Goto Database and then select RDS\" \/><\/a><\/p>\n<p><strong>Step 2:<\/strong> In the next screen , choose the MySQL Engine<\/p>\n<p><a href=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/MySQLEngine.png\"><img decoding=\"async\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/MySQLEngine.png\" alt=\"Choose Mysql engine\" width=\"678\" height=\"376\" class=\"aligncenter wp-image-25381 size-full\" title=\"Choose Mysql engine\" \/><\/a><\/p>\n<p><strong>Step 3:<\/strong> Choose the option of hosting a production database which automatically comes with the Multi-AZ option.<\/p>\n<p><a href=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/ChooseDatabase.png\"><img decoding=\"async\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/ChooseDatabase.png\" alt=\"Choose the option of hosting a production database\" width=\"818\" height=\"292\" class=\"aligncenter wp-image-25370 size-full\" title=\"Choose the option of hosting a production database\" \/><\/a><\/p>\n<p><strong>Step 4:<\/strong> In the DB details , the Multi-AZ Deployment will be marked as \u2018Yes\u2019.<\/p>\n<p><a href=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/DBDetails.png\"><img decoding=\"async\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/DBDetails.png\" alt=\"Multi-AZ Deployment marked as \u2018Yes\u2019.\" width=\"567\" height=\"449\" class=\"aligncenter wp-image-25376 size-full\" title=\"Multi-AZ Deployment marked as \u2018Yes\u2019.\" \/><\/a><\/p>\n<p>Specify a database name , user name and password and click on Next step<\/p>\n<p><a href=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/DBSettings.png\"><img decoding=\"async\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/DBSettings.png\" alt=\"Specify a database name , user name and password\" width=\"739\" height=\"286\" class=\"aligncenter wp-image-25378 size-full\" title=\"Specify a database name , user name and password\" \/><\/a><\/p>\n<p><strong>Step 5:<\/strong> In the next step, choose the VPC. It always a good practice to ensure the database is not publicly accessible.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/AdvancedSettings.png\" alt=\"Configure Advanced Settings\" width=\"552\" height=\"324\" class=\"aligncenter wp-image-25368 size-full\" title=\"Configure Advanced Settings\" \/><\/p>\n<p>Accept all the default settings and click on Launch DB Instance.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/LaunchDB.png\" alt=\"Accept settings and Launch DB Instance\" width=\"777\" height=\"490\" class=\"aligncenter wp-image-25379 size-full\" title=\"Accept settings and Launch DB Instance\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>Once the database is created, you would get the endpoint for the database<\/p>\n<p><a href=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/DBEndpoint.png\"><img decoding=\"async\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/DBEndpoint.png\" alt=\"Get the endpoint for the database\" width=\"1057\" height=\"205\" class=\"aligncenter wp-image-25377 size-full\" title=\"Get the endpoint for the database\" \/><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Creating_a_Read_Replica\"><\/span>Creating a Read Replica<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Let\u2019s now look at the steps involved in creating a Read Replica database. For our example, we will use a MySQL database which was created in the earlier steps.<\/p>\n<p><strong>Step 1:<\/strong> After logging into the console , go to the Database-&gt;RDS section<\/p>\n<p><a href=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/Database.png\"><img decoding=\"async\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/Database.png\" alt=\"Goto Database and then RDS section\" width=\"153\" height=\"139\" class=\"aligncenter wp-image-25374 size-full\" title=\"Goto Database and then RDS section\" \/><\/a><\/p>\n<p><strong>Step 2:<\/strong> Navigate to the database which was created in the earlier step. Choose the Instance Actions and choose on Create Read Replica.<\/p>\n<p><a href=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/CreateReadReplica.png\"><img decoding=\"async\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/CreateReadReplica.png\" alt=\"Choose the Instance Actions and choose on Create Read Replica.\" width=\"621\" height=\"229\" class=\"aligncenter wp-image-25373 size-full\" title=\"Choose the Instance Actions and choose on Create Read Replica.\" \/><\/a><\/p>\n<p><strong>Step 3:<\/strong> In the next step , you need to choose the instance details which will be used to host the read replica. Also you need to mention the provisioned IOPS and the source database. You then to also specify the new instance identifier for the read replica database.<\/p>\n<p><a href=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/ReadReplicaDBInstance.png\"><img decoding=\"async\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/ReadReplicaDBInstance.png\" alt=\"Create Read Replica DB Instance\" width=\"824\" height=\"447\" class=\"aligncenter wp-image-25382 size-full\" title=\"Create Read Replica DB Instance\" \/><\/a><\/p>\n<p><strong>Step 4:<\/strong> You can also decide on the region in which the Read replica can be launched in<\/p>\n<p><a href=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/ReadReplicaResgion.png\"><img decoding=\"async\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/ReadReplicaResgion.png\" alt=\"Decide on region to launch Read Replica\" width=\"876\" height=\"327\" class=\"aligncenter wp-image-25383 size-full\" title=\"Decide on region to launch Read Replica\" \/><\/a><\/p>\n<p><strong>Step 5:<\/strong> Once all the settings are in place, just click on Create Read Replica.<\/p>\n<p><a href=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/ClickCreateReadReplica.png\"><img decoding=\"async\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/ClickCreateReadReplica.png\" alt=\"Click Create Read Replica\" width=\"1115\" height=\"349\" class=\"aligncenter wp-image-25372 size-full\" title=\"Click Create Read Replica\" \/><\/a><\/p>\n<p>Once the database has been created you will be able to see this database in the console and use this like an ordinary database<\/p>\n<p><a href=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/DBCreated.png\"><img decoding=\"async\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2024\/05\/DBCreated.png\" alt=\"Database Created and shown in console\" width=\"1105\" height=\"307\" class=\"aligncenter wp-image-25375 size-full\" title=\"Database Created and shown in console\" \/><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Final_Points_to_Remember_about_RDS_Multi-AZ_and_Read_Replica\"><\/span><b>Final Points to Remember about RDS Multi-AZ and Read Replica<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>In Multi-AZ, the data from the primary instance is replicated to a secondary instance.<\/li>\n<li>The secondary instance is located in another Availability zone.<\/li>\n<li>In Read Replica, a snapshot is taken of the primary database.<\/li>\n<li>Read replicas are available in Amazon RDS for\u00a0<a href=\"https:\/\/aws.amazon.com\/rds\/mysql\/\" target=\"_blank\" rel=\"noopener\">MySQL<\/a>,\u00a0<a href=\"https:\/\/aws.amazon.com\/rds\/mariadb\/\" target=\"_blank\" rel=\"noopener\">MariaDB<\/a>, and\u00a0<a href=\"https:\/\/aws.amazon.com\/rds\/postgresql\/\" target=\"_blank\" rel=\"noopener\">PostgreSQL<\/a>.<\/li>\n<li>Read replicas in Amazon RDS for MySQL, MariaDB, and PostgreSQL provide a complementary availability mechanism to\u00a0<a href=\"https:\/\/aws.amazon.com\/rds\/details\/multi-az\/\" target=\"_blank\" rel=\"noopener\">Amazon RDS Multi-AZ Deployments<\/a><\/li>\n<li>All traffic between the source and destination database is encrypted for Read Replica\u2019s.<\/li>\n<li>The standby replica in a Multi-AZ deployment cannot take on read requests. It is only meant for a failover and is not used for read purposes.<\/li>\n<li>You need to enable backups before creating Read replica\u2019s. This can be done by setting the backup retention period to a value other than 0<\/li>\n<li>Amazon RDS for MySQL, MariaDB and PostgreSQL currently allow you to create up to five Read Replicas for a given source DB Instance<\/li>\n<li>It is possible to create a read replica of another read replica. You can create a second-tier Read Replica from an existing first-tier Read Replica. By creating a second-tier Read Replica, you may be able to move some of the replication load from the master database instance to a first-tier Read Replica.<\/li>\n<li>Even though a read replica is updated from the source database, the target replica can still become out of sync due to various reasons.<\/li>\n<li>You can delete a read replica at any point in time.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Summary\"><\/span>Summary<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><strong>Don\u2019t MISS IT :<a href=\"\/\/www.whizlabs.com\/aws-solutions-architect-professional\/practice-tests\/\"> AWS Certified Solutions Architect Professional &#8211; Practice Tests(50% Discount) <\/a><\/strong><\/li>\n<\/ul>\n<p><span>In this article we have explained about AWS RDS Multi AZ and Read Replica. This is one of the most important feature\u00a0offered by Amazon Web Services (AWS) that will help the Developers. You would expect lot of questions from this topic in your certification exam.\u00a0<\/span><\/p>\n<p><strong>If you are preparing for the AWS certifications exam and looking for any help, please send us a mail or call to our customer support team.\u00a0<\/strong><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Are you preparing for AWS Certified Solutions Architect Professional certification exam?\u00a0In this space, we are writing series of articles on topics which are covered in the Solutions Architect Professional\u00a0certification exam. In this article, we are explaining one of the important feature available with Amazon web services which is AWS RDS Multi-AZ and Read Replica. You would expect lot of questions from this topic for Solutions Architect Professional\u00a0exam. You can subscribe to us for receiving the further updates on this topic. AWS Certified Solutions Architect Professional &#8211; Free Test How to prepare for AWS certified solutions architect professional exam? This topic 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