Is `log_bin` necessary on slave in master-slave MySQL replication?
If the slave is not a master to other slaves, then you do not need binary logging on the slave

To reclaim the space of those logs on the Slave immediately, run this

mysql&gt; STOP SLAVE;
mysql&gt; RESET MASTER;
mysql&gt; START SLAVE;


This will hose all binary logs on the Slave.

You could then remove or comment out log_bin from the my.cnf of the Slave and restart mysqld