Question: How do you turn off replication in PostgreSQL?

Answer

Turning off replication in PostgreSQL involves several steps, primarily depending on the type of replication set up: streaming replication or logical replication. Below are the general steps for disabling both types.

Streaming Replication

Streaming replication is typically set up with a primary and one or more standby servers.

  1. On the Standby Servers: First, you need to stop the PostgreSQL service on each standby server.

    sudo systemctl stop postgresql

    After stopping the service, you can proceed to reconfigure the server to work as a standalone instance or remove its data directory if it's no longer needed.

  2. On the Primary Server: You don't necessarily have to do anything on the primary server if you're just turning off the replication. However, you might want to remove or comment out replication configurations in postgresql.conf (e.g., max_wal_senders, wal_level) and pg_hba.conf that were specifically set for replication.

    After making changes, reload the PostgreSQL configuration:

    sudo systemctl reload postgresql

Logical Replication

Disabling logical replication involves dropping subscriptions on the subscriber database(s) and publications on the publisher database.

  1. On the Subscriber Database(s):

    Connect to the subscriber database and drop the subscription.

    DROP SUBSCRIPTION my_subscription;

    This command stops the replication from the publication(s) it was subscribed to.

  2. On the Publisher Database:

    Connect to the publisher database and drop the publication.

    DROP PUBLICATION my_publication;

    Dropping the publication will remove the ability for subscribers to receive data from this database.

General Notes

  • After disabling replication, you may also want to review any backup procedures that were relying on the replication setup.
  • Ensure you have proper backups before making changes to your replication setup.
  • The exact steps can vary based on your specific setup and PostgreSQL version, so it's always good to refer to the official PostgreSQL documentation or consult with a database administrator.

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