15.7.7.34 SHOW RELAYLOG EVENTS Statement (original) (raw)

15.7.7.34 SHOW RELAYLOG EVENTS Statement

SHOW RELAYLOG EVENTS
    [IN 'log_name']
    [FROM pos]
    [LIMIT [offset,] row_count]
    [channel_option]

channel_option:
    FOR CHANNEL channel

Shows the events in the relay log of a replica. If you do not specify'_`logname`_', the first relay log is displayed. This statement has no effect on the source. SHOW RELAYLOG EVENTS requires theREPLICATION SLAVE privilege.

The LIMIT clause has the same syntax as for the SELECT statement. SeeSection 15.2.13, “SELECT Statement”.

Note

Issuing a SHOW RELAYLOG EVENTS with no LIMIT clause could start a very time- and resource-consuming process because the server returns to the client the complete contents of the relay log (including all statements modifying data that have been received by the replica).

The optional FOR CHANNEL_`channel`_ clause enables you to name which replication channel the statement applies to. Providing a FOR CHANNEL_`channel`_ clause applies the statement to a specific replication channel. If no channel is named and no extra channels exist, the statement applies to the default channel.

When using multiple replication channels, if aSHOW RELAYLOG EVENTS statement does not have a channel defined using a FOR CHANNEL_`channel`_ clause an error is generated. See Section 19.2.2, “Replication Channels” for more information.

SHOW RELAYLOG EVENTS displays the following fields for each event in the relay log:

• Log_name
  The name of the file that is being listed.
• Pos
  The position at which the event occurs.
• Event_type
  An identifier that describes the event type.
• Server_id
  The server ID of the server on which the event originated.
• End_log_pos
  The value of End_log_pos for this event in the source's binary log.
• Info
  More detailed information about the event type. The format of this information depends on the event type.

For compressed transaction payloads, theTransaction_payload_event is first printed as a single unit, then it is unpacked and each event inside it is printed.

Some events relating to the setting of user and system variables are not included in the output from SHOW RELAYLOG EVENTS. To get complete coverage of events within a relay log, use mysqlbinlog.