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25.11.11.2 The replication_connection_status Table

This table shows the current status of the I/O thread that handles the slave server connection to the master server.

Compared to the replication_connection_configuration table, replication_connection_status changes more frequently. It contains values that change during the connection, whereas replication_connection_configuration contains values which define how the slave connects to the master and that remain constant during the connection.

The replication_connection_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 16.2.3, “Replication Channels” for more information.

  • GROUP_NAME

    If this server is a member of a group, shows the name of the group the server belongs to.

  • SOURCE_UUID

    The server_uuid value from the master.

  • THREAD_ID

    The I/O thread ID.

  • SERVICE_STATE

    ON (thread exists and is active or idle), OFF (thread no longer exists), or CONNECTING (thread exists and is connecting to the master).

  • RECEIVED_TRANSACTION_SET

    The set of global transaction IDs (GTIDs) corresponding to all transactions received by this slave. Empty if GTIDs are not in use. See GTID Sets for more information.

  • LAST_ERROR_NUMBER, LAST_ERROR_MESSAGE

    The error number and error message of the most recent error that caused the I/O thread to stop. An error number of 0 and message of the empty string mean no error. If the LAST_ERROR_MESSAGE value is not empty, the error values also appear in the slave's error log.

    Issuing RESET MASTER or RESET SLAVE resets the values shown in these columns.

  • LAST_ERROR_TIMESTAMP

    A timestamp in YYMMDD HH:MM:SS format that shows when the most recent I/O error took place.

  • LAST_HEARTBEAT_TIMESTAMP

    A timestamp in YYMMDD HH:MM:SS format that shows when the most recent heartbeat signal was received by a replication slave.

  • COUNT_RECEIVED_HEARTBEATS

    The total number of heartbeat signals that a replication slave received since the last time it was restarted or reset, or a CHANGE MASTER TO statement was issued.

TRUNCATE TABLE is not permitted for the replication_connection_status table.

The following table shows the correspondence between replication_connection_status columns and SHOW SLAVE STATUS columns.

replication_connection_status Column SHOW SLAVE STATUS Column
SOURCE_UUID Master_UUID
THREAD_ID None
SERVICE_STATE Slave_IO_Running
RECEIVED_TRANSACTION_SET Retrieved_Gtid_Set
LAST_ERROR_NUMBER Last_IO_Errno
LAST_ERROR_MESSAGE Last_IO_Error
LAST_ERROR_TIMESTAMP Last_IO_Error_Timestamp

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