Help Center/ Data Replication Service/ Real-Time Synchronization/ Operation Reference in Synchronization Scenarios/ Forcibly Stopping Synchronization of GaussDB Primary/Standby
Updated on 2024-03-28 GMT+08:00
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Forcibly Stopping Synchronization of GaussDB Primary/Standby

This section describes how to clear the streaming replication slots of the source GaussDB primary/standby database after the synchronization task is forcibly stopped.

The naming rule of a replication slot depends on the database kernel version (you can run the select working_version_num(); command to view the version). If the version is earlier than 92556, serial decoding is used by default. The naming rule of a replication slot is replication_slot_unique_ID. If the version is 92556 or later, parallel decoding is used by default. The naming rule of a replication slot is drs_unique_ID. To obtain the unique ID, replace the hyphen (-) in the task node ID with an underscore (_). You can find the node ID in the task node id is *** log on the Synchronization Logs page.

Prerequisites

Common users do not have the permission to perform the execute direct operation. To delete streaming replication slots, contact GaussDB O&M personnel.

Procedure

  1. Log in to the GaussDB primary/standby instance as the user used when you tested connectivity between the DRS instance and the GaussDB primary/standby instance.
  2. Run the following statement to query the streaming replication slot name of the database object selected for the synchronization task: 

    select slot_name from pg_replication_slots where database = 'database';

    In the preceding command, database indicates the database selected in the synchronization task.

  3. Run the following statement to delete the streaming replication slot: 

    select * from pg_drop_replication_slot('slot_name');

    In the preceding command, slot_name indicates the name of the streaming replication slot queried in 2.

  4. Run the following statement to check whether the streaming replication slot is successfully deleted: 

    select slot_name from pg_replication_slots where database = 'database';

    If the query result is empty, the streaming replication slot is deleted.