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I'm having a master/slave mysql setup. This night I had some problems with the master. I needed to recreate all databases again because they were corrupt.

Now I stopped my mysql slave but want to start it again and rebuild everything from scratch. Is there a way to do this? Without locking the master...

I also think the binlog file should be reset. So everything is clean again.

Any ideas?

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2 Answers 2

up vote 3 down vote accepted

if you use innodb engine on the master - just use mysqldump with --skip-lock-tables, --single-transaction and --master-data=2 switches.

if your slave is only logically corrupted - try pt-table-sync with lock=0 option

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If I set the master-data to 2 the change master query is put in comment. But how about the pointer in the binlog? And should I reset the binlog? –  Ward Loockx Sep 1 '12 at 9:37
you can set it to 1 to get it uncommented. i prefer to get have --master-data=2 and later - when i'm ready copy & paste the CHANGE MASTER TO to the mysql command line on a slave. dont reset binlog on master; i assume your slave will be a clean slate - so there's no need of resetting anything there. just reload the dump, issue CHANGE MASTER TO and include address and credentials of master host. –  pQd Sep 1 '12 at 9:42
Currently the slave is already configured, I just did STOP SLAVE. So I just need to import the new dump and that's it ? –  Ward Loockx Sep 1 '12 at 9:43
ok - so import new dump on slave; it'll drop all existing databases anyway. then issue CHANGE MASTER TO.. and SLAVE START. then check SHOW SLAVE STATUS\G. for a good measure run pt-table-checksum to make sure all is in sync. –  pQd Sep 1 '12 at 9:44

Follow this:

  • Disconnect slave and master
  • Just drop all databases from slave
  • dump data from master with single-transaction
  • use dump on slave
  • reconnect master and slave, and wait for sync-ing
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