Comments on: When SHOW SLAVE STATUS and the error log Disagree http://www.pythian.com/blogs/876/when-show-slave-status-and-the-error-log-disagree News and views from Pythian DBAs Sat, 22 Nov 2008 10:23:32 +0000 http://wordpress.org/?v=2.3.2 By: gratton http://www.pythian.com/blogs/876/when-show-slave-status-and-the-error-log-disagree#comment-220100 gratton Wed, 18 Jun 2008 21:02:37 +0000 http://www.pythian.com/blogs/876/when-show-slave-status-and-the-error-log-disagree#comment-220100 Thanks Xaprb! I had highlighted the wrong line. It has been fixed. Thanks again for catching it! Thanks Xaprb! I had highlighted the wrong line. It has been fixed.
Thanks again for catching it!

]]> By: Xaprb http://www.pythian.com/blogs/876/when-show-slave-status-and-the-error-log-disagree#comment-219867 Xaprb Wed, 18 Jun 2008 12:07:53 +0000 http://www.pythian.com/blogs/876/when-show-slave-status-and-the-error-log-disagree#comment-219867 There are three sets of file/position coordinates in SHOW SLAVE STATUS: 1) The position, ON THE MASTER, from which the I/O thread is reading: Master_Log_File/Read_Master_Log_Pos. 2) The position, IN THE RELAY LOGS, at which the SQL thread is executing: Relay_Log_File/Relay_Log_Pos 3) The position, ON THE MASTER, at which the SQL thread is executing: Relay_Master_Log_File/Exec_Master_Log_Pos You are mixing and matching from different sets, and you can't do that. In many cases they'll have the same thing and it doesn't matter. But not in the general case. There are three sets of file/position coordinates in SHOW SLAVE STATUS:

1) The position, ON THE MASTER, from which the I/O thread is reading: Master_Log_File/Read_Master_Log_Pos.

2) The position, IN THE RELAY LOGS, at which the SQL thread is executing: Relay_Log_File/Relay_Log_Pos

3) The position, ON THE MASTER, at which the SQL thread is executing: Relay_Master_Log_File/Exec_Master_Log_Pos

You are mixing and matching from different sets, and you can’t do that. In many cases they’ll have the same thing and it doesn’t matter. But not in the general case.

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