{"id":5537,"date":"2024-03-27T09:02:24","date_gmt":"2024-03-27T09:02:24","guid":{"rendered":"https:\/\/test.opensource-db.in\/wp1\/?p=5537"},"modified":"2024-03-27T09:02:26","modified_gmt":"2024-03-27T09:02:26","slug":"unlocking-initial-sync-for-logical-replication-in-aws-rds-for-postgresql","status":"publish","type":"post","link":"https:\/\/test.opensource-db.in\/wp1\/unlocking-initial-sync-for-logical-replication-in-aws-rds-for-postgresql\/","title":{"rendered":"Unlocking Initial Sync for Logical Replication in AWS RDS for PostgreSQL"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">PostgreSQL&#8217;s logical replication is handled through publications and subscriptions. Publications define what data to replicate, while subscriptions specify which server receives the updates.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Initial synchronization ensures the subscriber has all the data. Common methods include:<\/p>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\"><em><strong>Snapshot<\/strong>: Copies all data at once. Simple but slow for large datasets.<br><strong>Base Backup and Continuous Archiving<\/strong>: Makes a base copy and then tracks changes. More suitable for large datasets.<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, when dealing with massive databases in RDS PostgreSQL, such as those in the terabyte range, using pg_basebackup for base backup might not work due to security restrictions on file systems. pg_basebackup requires deep file system access, which is limited in RDS for security reasons. In such cases, replication needs to be set up using the pg_dump utility instead.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Before proceeding, ensure the following configuration parameters are set and restart the cluster:<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<pre class=\"wp-block-code\"><code>max_replication_slots: 10\nmax_wal_senders: 10\ntrack_commit_timestamp: on\nwal_level: logical\n<\/code><\/pre>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Next, create a publication and add tables to it in the source database:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE PUBLICATION lsr_sync_01;\nALTER PUBLICATION lsr_sync_01 ADD TABLE sales_data;\nALTER PUBLICATION lsr_sync_01 ADD TABLE customer_info;\nALTER PUBLICATION lsr_sync_01 ADD TABLE transactions;\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Create a replication slot:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To create a replication connection to the database and establish a replication slot, follow these steps:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Open a separate terminal session.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Keep the session active, preferably using a screen session.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Run the following command:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#091;postgres@primary ~]$ psql -h primary -U repmgr \"dbname=osdb_lsr replication=database\"\npsql (10.23, server 14.10)\nWARNING: psql major version 10, server major version 14.\n         Some psql features might not work.\nType \"help\" for help.\n\nosdb_lsr=# CREATE_REPLICATION_SLOT lsr_sync_01 LOGICAL pgoutput;\n  slot_name  | consistent_point |    snapshot_name    | output_plugin\n-------------+------------------+---------------------+---------------\n lsr_sync_01 | 0\/C000110        | 00000003-00000002-1 | pgoutput\n(1 row)\n\nNow let's proceed with backing up the database using pg_dump.\n\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>pg_dump -h primary -U repmgr -t sales_data -t customer_info -t transactions -Fd -f osdb_lsr_intial_sync -j 2 --no-publications --no-subscriptions --snapshot=00000003-00000002-1 --compress=0 -v osdb_lsr<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Restore the backup on the target for LSR:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>pg_restore -h standby -U repmgr -Fd -j 2 -v -d osdb_lsr osdb_lsr_intial_sync<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Create a subscription:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Create the subscription on the standby server, referring to the primary database, but keep it in a disabled state.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE SUBSCRIPTION lsr_sync_sub_01 CONNECTION 'host=primary port=5432 dbname=osdb_lsr user=repmgr password=*****' PUBLICATION lsr_sync_01\nWITH (\n  copy_data = false,\n  create_slot = false,\n  enabled = false,\n  connect = true,\n  slot_name = 'lsr_sync_01'\n);\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Advance the replication origin:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Retrieve the external ID from the pg_subscription table and use it to advance the replay position to the consistent point captured during replication slot creation.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>standby=# SELECT 'pg_'||oid::text AS \"external_id\" FROM pg_subscription WHERE subname = 'lsr_sync_sub_01';\n external_id\n-------------\n pg_32119\n(1 row)\n\nTake the position of the LSN from the replication slot creation and make it advance to start the replication\n\nstandby=# SELECT pg_replication_origin_advance('pg_32119', '0\/C000110') ;\n pg_replication_origin_advance\n-------------------------------\n \n(1 row)\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Enable the subscription:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ALTER SUBSCRIPTION lsr_sync_sub_01 ENABLE;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Check the replication status:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT * FROM pg_stat_replication;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">This series of steps helps to establish logical replication in PostgreSQL, ensuring data synchronization between databases efficiently.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PostgreSQL&#8217;s logical replication is handled through publications and subscriptions. Publications define what data to replicate, while subscriptions specify which server [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":5540,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[52,1],"tags":[34,26],"class_list":["post-5537","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-customer-success","category-others","tag-dba","tag-postgresql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Unlocking Initial Sync for Logical Replication in AWS RDS for PostgreSQL - OpenSource DB<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Unlocking Initial Sync for Logical Replication in AWS RDS for PostgreSQL - OpenSource DB\" \/>\n<meta property=\"og:description\" content=\"PostgreSQL&#8217;s logical replication is handled through publications and subscriptions. 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