Help Center/ Relational Database Service_RDS for PostgreSQL/ FAQs/ Read Replicas and Read/Write Splitting/ Can I Change the Replication Mode Between RDS for PostgreSQL Primary Instances and Read Replicas?
Updated on 2025-06-24 GMT+08:00

Can I Change the Replication Mode Between RDS for PostgreSQL Primary Instances and Read Replicas?

Both asynchronous (default) and synchronous replication between the primary and standby instances are supported.

  • Asynchronous replication is recommended for applications requiring a guarantee of high availability.
  • Synchronous replication is recommended for applications that require strong data consistency and can tolerate a short-time blocking of write operations.

The asynchronous-commit mode is supported between primary instances and read replicas and cannot be modified.