29.12.11.3 The replication_applier_status Table

This table shows the current general transaction execution status on the replica. The table provides information about general aspects of transaction applier status that are not specific to any thread involved. Thread-specific status information is available in the replication_applier_status_by_coordinator table (and replication_applier_status_by_worker if the replica is multithreaded).

The replication_applier_status 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.

• SERVICE_STATE

  Shows ON when the replication channel's applier threads are active or idle, OFF means that the applier threads are not active.

• REMAINING_DELAY

  If the replica is waiting for DESIRED_DELAY seconds to pass since the source applied a transaction, this field contains the number of delay seconds remaining. At other times, this field is NULL. (The DESIRED_DELAY value is stored in the replication_applier_configuration table.) See Section 19.4.11, “Delayed Replication” for more information.

• COUNT_TRANSACTIONS_RETRIES

  Shows the number of retries that were made because the replication SQL thread failed to apply a transaction. The maximum number of retries for a given transaction is set by the system variable replica_transaction_retries and slave_transaction_retries. The replication_applier_status_by_worker table shows detailed information on transaction retries for a single-threaded or multithreaded replica.

The replication_applier_status table has these indexes:

• Primary key on (CHANNEL_NAME)

TRUNCATE TABLE is not permitted for the replication_applier_status table.

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

replication_applier_status Column	SHOW REPLICA STATUS Column
SERVICE_STATE	None
REMAINING_DELAY	SQL_Remaining_Delay