Comments on: Set up MySQL database replication http://www.ghacks.net/2009/04/09/set-up-mysql-database-replication/ A technology blog covering software, mobile phones, gadgets, security, the Internet and other relevant areas. Wed, 25 Nov 2009 10:02:41 -0600 http://wordpress.org/?v=2.8.6 hourly 1 By: Pier-Olivier P. Côté http://www.ghacks.net/2009/04/09/set-up-mysql-database-replication/#comment-719031 Pier-Olivier P. Côté Fri, 10 Apr 2009 21:58:33 +0000 http://www.ghacks.net/?p=11853#comment-719031 DATABASE REPLICATION IS NOT A BACKUP, you should always have a backup policy although replication is usefull it doesn't cover everything and I think its article mislead people at the beginning: "But backing up a database and being able to use that backup depends upon the back up being always up to date. There is a method that ensures you will always have an up to date backup." Replication is not a backup policy. A mistyped DELETE statement will be replicated on the slave too, and you could end up with two, perfectly synchronized, empty databases. Replication can help protect against hardware failure though. (http://www.databasejournal.com/features/mysql/article.php/3355201/Database-Replication-in-MySQL.htm) You've been warned. DATABASE REPLICATION IS NOT A BACKUP, you should always have a backup policy although replication is usefull it doesn’t cover everything and I think its article mislead people at the beginning:

“But backing up a database and being able to use that backup depends upon the back up being always up to date. There is a method that ensures you will always have an up to date backup.”

Replication is not a backup policy. A mistyped DELETE statement will be replicated on the slave too, and you could end up with two, perfectly synchronized, empty databases. Replication can help protect against hardware failure though. (http://www.databasejournal.com/features/mysql/article.php/3355201/Database-Replication-in-MySQL.htm)

You’ve been warned.

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