17.4.1.19. Replication and Temporary Tables

This section does not apply when row-based replication is in use because in that case temporary tables are not replicated. It does apply with mixed-format replication for statements involving temporary tables that can be logged safely using statement-based format. See Section 17.1.2.2, “Safe and Unsafe Statements in Logging and Replication”.

Safe slave shutdown when using temporary tables.  Temporary tables are replicated except in the case where you stop the slave server (not just the slave threads) and you have replicated temporary tables that are open for use in updates that have not yet been executed on the slave. If you stop the slave server, the temporary tables needed by those updates are no longer available when the slave is restarted. To avoid this problem, do not shut down the slave while it has temporary tables open. Instead, use the following procedure:

  1. Issue a STOP SLAVE SQL_THREAD statement.

  2. Use SHOW STATUS to check the value of the Slave_open_temp_tables variable.

  3. If the value is not 0, restart the slave SQL thread with START SLAVE SQL_THREAD and repeat the procedure later.

  4. When the value is 0, issue a mysqladmin shutdown command to stop the slave.

Temporary tables and replication options.  By default, all temporary tables are replicated; this happens whether or not there are any matching --replicate-do-db, --replicate-do-table, or --replicate-wild-do-table options in effect. However, the --replicate-ignore-table and --replicate-wild-ignore-table options are honored for temporary tables.

A recommended practice when using statement-based or mixed-format replication is to designate a prefix for exclusive use in naming temporary tables that you do not want replicated, then employ a --replicate-wild-ignore-table option to match that prefix. For example, you might give all such tables names beginning with norep (such as norepmytable, norepyourtable, and so on), then use --replicate-wild-ignore-table=norep% to prevent them from being replicated.

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