The following list shows the most common states you may see in
the State column for a slave server SQL
thread:
Waiting for the next event in relay log
The initial state before Reading event from the
relay log.
Reading event from the relay log
The thread has read an event from the relay log so that the event can be processed.
The thread is executing a
LOAD DATA
INFILE statement and is creating a temporary
file containing the data from which the slave will read
rows.
Slave 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.
Waiting until MASTER_DELAY seconds after master
executed event
The SQL thread has read an event but is waiting for the
slave delay to lapse. This delay is set with the
MASTER_DELAY option of
CHANGE MASTER TO.
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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