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29.12.11.7 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 thereplication_applier_status_by_coordinator table (andreplication_applier_status_by_worker if the replica is multithreaded).

Thereplication_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. SeeSection 19.2.2, “Replication Channels” for more information.

  • SERVICE_STATE

    ShowsON 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 forDESIRED_DELAY seconds to pass since the source applied a transaction, this field contains the number of delay seconds remaining. At other times, this field isNULL. (TheDESIRED_DELAY value is stored in thereplication_applier_configuration table.) SeeSection 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 variablereplica_transaction_retries. Thereplication_applier_status_by_worker table shows detailed information on transaction retries for a single-threaded or multithreaded replica.

Thereplication_applier_status table has these indexes:

  • Primary key on (CHANNEL_NAME)

TRUNCATE TABLE is not permitted for thereplication_applier_status table.

The following table shows the correspondence betweenreplication_applier_status columns andSHOW REPLICA STATUS columns.

replication_applier_status ColumnSHOW REPLICA STATUS Column
SERVICE_STATENone
REMAINING_DELAYSQL_Remaining_Delay