Amazon Relational Database Service (Amazon RDS) PostgreSQL Multi-AZ deployments with two readable standbys now supports major version upgrades.
Starting this week, RDS PostgreSQL is possible to upgrade multi-AZ deployments with two readable standbys from major version 13.4 and above and 14.5 and above to 15.4 with just a few clicks on the AWS Management Console.
PostgreSQL 15.4 offers several performance and feature benefits that include SQL standard "MERGE" command for conditional SQL queries, performance improvements for both in-memory and disk-based sorting, and support for two-phase commit and row/column filtering for logical replication.
PostgreSQL 15 release also adds support for new extension pg_walinspect, and server-side compression with Gzip, LZ4, or Zstandard (zstd) using pg_basebackup.
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