This article explains how to use PostgreSQL logical replication with Amazon RDS Multi-AZ clusters for data consolidation and analytical applications.

• Logical replication enables selective table replication between PostgreSQL instances or different systems
• Supports publish-subscribe model using write-ahead log (WAL) change records
• RDS Multi-AZ clusters support logical replication for PostgreSQL 14.8-R2+ and 15.3-R2+
• Use cases include real-time data streaming, event-driven architectures, and ETL processes
• Replication slots persist WAL files until consumed; requires monitoring disk space and replication lag
• Schema changes, large objects, and sequence data are not automatically replicated
• Logical replication survives DB cluster failovers with automatic reconnection capability
• Best practices include cleaning unused slots, monitoring consumers, and avoiding unsupported DDL commands

Logical replication with RDS Multi-AZ clusters provides flexible, granular data synchronization for production workloads requiring real-time data distribution and integration.