The following list shows the most common states you may see in
State column for a slave server SQL
The initial state before
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 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.
The thread is executing a
LOAD DATA INFILEstatement and is creating a temporary file containing the data from which the slave will read rows.
A very brief state that occurs as the thread is stopping.
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.