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6.4.3. Replication Slave SQL Thread States

The following list shows the most common states you may see in the State column for a slave server SQL thread:

  • Reading event from the relay log

    The thread has read an event from the relay log so that the event can be processed.

  • Has read all relay log; waiting for the slave I/O thread to update it

    The thread has processed all events in the relay log files, and is now waiting for the I/O thread to write new events to the relay log.

  • Waiting for slave mutex on exit

    A very brief state that occurs as the thread is stopping.

The State column for the I/O thread may also show the text of a statement. This indicates that the thread has read an event from the relay log, extracted the statement from it, and is executing it.


 
 
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