(mysql.info) purge-master-logs

(mysql.info) replication-master-sql

 
 13.6.1.1 `PURGE MASTER LOGS' Syntax
 ...................................
 
      PURGE {MASTER | BINARY} LOGS TO 'LOG_NAME'
      PURGE {MASTER | BINARY} LOGS BEFORE 'DATE'
 
 Deletes all the binary logs listed in the log index prior to the
 specified log or date. The logs also are removed from the list recorded
 in the log index file, so that the given log becomes the first.
 
 Example:
 
      PURGE MASTER LOGS TO 'mysql-bin.010';
      PURGE MASTER LOGS BEFORE '2003-04-02 22:46:26';
 
 The `BEFORE' variant's DATE argument can be in `'YYYY-MM-DD hh:mm:ss''
 format.  `MASTER' and `BINARY' are synonyms.
 
 This statement is safe to run while slaves are replicating.  You do not
 need to stop them. If you have an active slave that currently is
 reading one of the logs you are trying to delete, this statement does
 nothing and fails with an error. However, if a slave is dormant and you
 happen to purge one of the logs it has yet to read, the slave will be
 unable to replicate after it comes up.
 
 To safely purge logs, follow this procedure:
 
   1. On each slave server, use `SHOW SLAVE STATUS' to check which log
      it is reading.
 
   2. Obtain a listing of the logs on the master server with `SHOW
      MASTER LOGS'.
 
   3. Determine the earliest log among all the slaves. This is the
      target log. If all the slaves are up to date, this is the last log
      on the list.
 
   4. Make a backup of all the logs you are about to delete.  (This step
      is optional, but always advisable.)
 
   5. Purge all logs up to but not including the target log.

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