Why Can’t I Find and Set the Parameters logical_replication and wal_sender_timeout Using the Command-Line Interface (CLI)?

Question

While enabling incremental updates by following step 7 of the Amazon Aurora PostgreSQL setup guide, I need to set the parameters logical_replication and wal_sender_timeout, but the parameters are unavailable. Why can't I find and set either parameter using the Command-Line Interface (CLI)?

Environment

Connector: Amazon Aurora PostgreSQL

Answer

The logical_replication and wal_sender_timeout parameters are cluster-level parameters. Therefore, you must adjust these parameters at the cluster level rather than the instance level.

To manage cluster-level parameters in an AWS DB cluster parameter group using the CLI, use the AWS modify-db-cluster-parameter-group CLI command. See AWS' modify-db-cluster-parameter-group documentation for more information.