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MySQL 5.6 Reference Manual
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13.4.2.3 RESET SLAVE Syntax

RESET SLAVE [ALL]

RESET SLAVE makes the slave forget its replication position in the master's binary log. This statement is meant to be used for a clean start: It clears the master info and relay log info repositories, deletes all the relay log files, and starts a new relay log file. It also resets to 0 the replication delay specified with the MASTER_DELAY option to CHANGE MASTER TO. To use RESET SLAVE, the slave replication threads must be stopped (use STOP SLAVE if necessary).

Note

All relay log files are deleted, even if they have not been completely executed by the slave SQL thread. (This is a condition likely to exist on a replication slave if you have issued a STOP SLAVE statement or if the slave is highly loaded.)

In MySQL 5.6 (unlike the case in MySQL 5.1 and earlier), RESET SLAVE does not change any replication connection parameters such as master host, master port, master user, or master password, which are retained in memory. This means that START SLAVE can be issued without requiring a CHANGE MASTER TO statement following RESET SLAVE.

Connection parameters are reset if the slave mysqld is shut down following RESET SLAVE. In MySQL 5.6.3 and later, you can instead use RESET SLAVE ALL to reset these connection parameters (Bug #11809016).

RESET SLAVE ALL does not clear the IGNORE_SERVER_IDS list set by CHANGE MASTER TO. This issue is fixed in MySQL 5.7. (Bug #18816897)

In MySQL 5.6.7 and later, RESET SLAVE causes an implicit commit of an ongoing transaction. See Section 13.3.3, “Statements That Cause an Implicit Commit”.

If the slave SQL thread was in the middle of replicating temporary tables when it was stopped, and RESET SLAVE is issued, these replicated temporary tables are deleted on the slave.

Note

When used on a MySQL Cluster replication slave SQL node, RESET SLAVE clears the mysql.ndb_apply_status table. You should keep in mind when using this statement that ndb_apply_status uses the NDB storage engine and so is shared by all SQL nodes attached to the slave cluster.

Beginning with MySQL Cluster NDB 7.4.9, you can override this behavior by issuing SET GLOBAL @ndb_clear_apply_status=OFF prior to executing RESET SLAVE, which keeps the slave from purging the ndb_apply_status table in such cases.


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