MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6

8.14.6 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:

The Info column for the SQL 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 may be executing it.