29.12.11.2 The replication_applier_configuration Table

This table shows the configuration parameters that affect transactions applied by the replica. Parameters stored in the table can be changed at runtime with the CHANGE REPLICATION SOURCE TO statement.

The replication_applier_configuration table has these columns:

• CHANNEL_NAME

  The replication channel which this row is displaying. There is always a default replication channel, and more replication channels can be added. See Section 19.2.2, “Replication Channels” for more information.

• DESIRED_DELAY

  The number of seconds that the replica must lag the source (CHANGE REPLICATION SOURCE TO option: SOURCE_DELAY). See Section 19.4.11, “Delayed Replication” for more information.

• PRIVILEGE_CHECKS_USER

  The user account that provides the security context for the channel (CHANGE REPLICATION SOURCE TO option: PRIVILEGE_CHECKS_USER). This is escaped so that it can be copied into an SQL statement to execute individual transactions. See Section 19.3.3, “Replication Privilege Checks” for more information.

• REQUIRE_ROW_FORMAT

  Whether the channel accepts only row-based events (CHANGE REPLICATION SOURCE TO option: REQUIRE_ROW_FORMAT). See Section 19.3.3, “Replication Privilege Checks” for more information.

• REQUIRE_TABLE_PRIMARY_KEY_CHECK

  Whether the channel requires primary keys always, never, or according to the source's setting (CHANGE REPLICATION SOURCE TO option: REQUIRE_TABLE_PRIMARY_KEY_CHECK). See Section 19.3.3, “Replication Privilege Checks” for more information.

• ASSIGN_GTIDS_TO_ANONYMOUS_TRANSACTIONS_TYPE

  Whether the channel assigns a GTID to replicated transactions that do not already have one (CHANGE REPLICATION SOURCE TO option: ASSIGN_GTIDS_TO_ANONYMOUS_TRANSACTIONS). OFF means no GTIDs are assigned. LOCAL means a GTID is assigned that includes the replica's own UUID (the server_uuid setting). UUID means a GTID is assigned that includes a manually set UUID. See Section 19.1.3.6, “Replication From a Source Without GTIDs to a Replica With GTIDs” for more information.

• APPLIER_VERSION

  The applier implementation configured for the channel (CHANGE REPLICATION SOURCE TO option: APPLIER_VERSION). 1 identifies the Multi-Threaded applier (MTA). 2 identifies the Change Stream Applier (CSA).

• APPLIER_WORKER_COUNT

  The number of worker threads configured for the channel (CHANGE REPLICATION SOURCE TO option: APPLIER_WORKER_COUNT).

• APPLIER_EVENT_MEMORY_LIMIT

  The per-channel memory limit configured for caching binary log events (CHANGE REPLICATION SOURCE TO option: APPLIER_EVENT_MEMORY_LIMIT).

• ASSIGN_GTIDS_TO_ANONYMOUS_TRANSACTIONS_VALUE

  The UUID that is used as part of the GTIDs assigned to anonymous transactions (CHANGE REPLICATION SOURCE TO option: ASSIGN_GTIDS_TO_ANONYMOUS_TRANSACTIONS). See Section 19.1.3.6, “Replication From a Source Without GTIDs to a Replica With GTIDs” for more information.

The replication_applier_configuration table has these indexes:

• Primary key on (CHANNEL_NAME)

TRUNCATE TABLE is not permitted for the replication_applier_configuration table.

The following table shows the correspondence between replication_applier_configuration columns and SHOW REPLICA STATUS columns.

replication_applier_configuration Column	SHOW REPLICA STATUS Column
DESIRED_DELAY	SQL_Delay