Comments on: How SHOW SLAVE STATUS relates to CHANGE MASTER TO http://www.mysqlperformanceblog.com/2008/07/07/how-show-slave-status-relates-to-change-master-to/ Everything about MySQL Performance Sat, 21 Nov 2009 05:23:57 -0800 http://wordpress.org/?v=2.8.4 hourly 1 By: martir http://www.mysqlperformanceblog.com/2008/07/07/how-show-slave-status-relates-to-change-master-to/comment-page-1/#comment-646631 martir Fri, 04 Sep 2009 06:50:28 +0000 http://www.mysqlperformanceblog.com/?p=432#comment-646631 I have problem and I don't know how to solve this problem. When I do the command "SHOW MASTER STATUS;' I get resoult "Empty set (0.00 sec)". I don't know what to do. Please if someone can halp me. Thanks a lot I have problem and I don’t know how to solve this problem. When I do the command “SHOW MASTER STATUS;’ I get resoult “Empty set (0.00 sec)”. I don’t know what to do. Please if someone can halp me. Thanks a lot

]]> By: Darko Bunic | www.redips.net http://www.mysqlperformanceblog.com/2008/07/07/how-show-slave-status-relates-to-change-master-to/comment-page-1/#comment-464186 Darko Bunic | www.redips.net Thu, 05 Feb 2009 10:52:34 +0000 http://www.mysqlperformanceblog.com/?p=432#comment-464186 Just to be sure. In case when slave stops to work (create table statement on master specified InnoDB storage but slave is MyISAM only), what options do I have to fix replication? - master executed SQL without any problem but slave didn't. 1) I suppose I can read the position from the master and write it to the slave with "change master to master_log_file= ..." statement 2) I suppose I can skip problematic statement with SQL_SLAVE_SKIP_COUNTER on slave only 3) is there any other option like: slave stop; change master to master_log_file='(binlog name in relay_master_log_file)', master_log_pos=(exec_master_log_pos number); slave start; ... on slave of course, or I missed the point. Just to be sure. In case when slave stops to work (create table statement on master specified InnoDB storage but slave is MyISAM only), what options do I have to fix replication? – master executed SQL without any problem but slave didn’t.
1) I suppose I can read the position from the master and write it to the slave with “change master to master_log_file= …” statement
2) I suppose I can skip problematic statement with SQL_SLAVE_SKIP_COUNTER on slave only
3) is there any other option like:
slave stop;
change master to master_log_file=’(binlog name in relay_master_log_file)’, master_log_pos=(exec_master_log_pos number);
slave start;
… on slave of course, or I missed the point.

]]> By: Jure Pecar http://www.mysqlperformanceblog.com/2008/07/07/how-show-slave-status-relates-to-change-master-to/comment-page-1/#comment-367291 Jure Pecar Tue, 28 Oct 2008 21:14:34 +0000 http://www.mysqlperformanceblog.com/?p=432#comment-367291 Looks like mysql 6 is introducing MASTER_IGNORE_SERVER_ID to fix this problem. See http://bugs.mysql.com/bug.php?id=25998 Looks like mysql 6 is introducing MASTER_IGNORE_SERVER_ID to fix this problem. See http://bugs.mysql.com/bug.php?id=25998

]]> By: Jure Pecar http://www.mysqlperformanceblog.com/2008/07/07/how-show-slave-status-relates-to-change-master-to/comment-page-1/#comment-365786 Jure Pecar Sun, 26 Oct 2008 08:47:45 +0000 http://www.mysqlperformanceblog.com/?p=432#comment-365786 So this article is misleading then? http://www.onlamp.com/pub/a/onlamp/2006/04/20/advanced-mysql-replication.html?page=5 So this article is misleading then?
http://www.onlamp.com/pub/a/onlamp/2006/04/20/advanced-mysql-replication.html?page=5

]]> By: Baron Schwartz http://www.mysqlperformanceblog.com/2008/07/07/how-show-slave-status-relates-to-change-master-to/comment-page-1/#comment-365733 Baron Schwartz Sun, 26 Oct 2008 06:04:15 +0000 http://www.mysqlperformanceblog.com/?p=432#comment-365733 Jure, don't do that. Here's just one problem: statements can get into an infinite loop if you remove a failed server from the setup. There are many more problems with it, too. Never use more than two servers in plain master-master. Jure, don’t do that. Here’s just one problem: statements can get into an infinite loop if you remove a failed server from the setup. There are many more problems with it, too. Never use more than two servers in plain master-master.

]]> By: Jure Pecar http://www.mysqlperformanceblog.com/2008/07/07/how-show-slave-status-relates-to-change-master-to/comment-page-1/#comment-364948 Jure Pecar Fri, 24 Oct 2008 18:40:58 +0000 http://www.mysqlperformanceblog.com/?p=432#comment-364948 When setting up automated failover and then failback in a circular A->B->C->D->A replication, which values does one use for master_log_file and master_log_pos in 'change master to' statement? When setting up automated failover and then failback in a circular A->B->C->D->A replication, which values does one use for master_log_file and master_log_pos in ‘change master to’ statement?

]]> By: PaulM http://www.mysqlperformanceblog.com/2008/07/07/how-show-slave-status-relates-to-change-master-to/comment-page-1/#comment-325166 PaulM Wed, 09 Jul 2008 12:11:45 +0000 http://www.mysqlperformanceblog.com/?p=432#comment-325166 So the bottom line is 1) When you are using the master as a consistent snapshot, use SHOW MASTER STATUS to determine the position. 2) When you are using a slave as a consistent snapshot, use SHOW SLAVE STATUS and Exec_Master_Log_Pos. So the bottom line is
1) When you are using the master as a consistent snapshot, use SHOW MASTER STATUS to determine the position.
2) When you are using a slave as a consistent snapshot, use SHOW SLAVE STATUS and Exec_Master_Log_Pos.

]]> By: peter http://www.mysqlperformanceblog.com/2008/07/07/how-show-slave-status-relates-to-change-master-to/comment-page-1/#comment-324908 peter Tue, 08 Jul 2008 17:29:08 +0000 http://www.mysqlperformanceblog.com/?p=432#comment-324908 Baron, Actually SHOW MASTER STATUS has column named "File" and SHOW SLAVE STATUS has Master_Log_File - check the example printouts above: Master_Log_File: db01-bin.003814 Baron,

Actually SHOW MASTER STATUS has column named “File” and SHOW SLAVE STATUS has Master_Log_File – check the example printouts above:

Master_Log_File: db01-bin.003814

]]> By: Baron Schwartz http://www.mysqlperformanceblog.com/2008/07/07/how-show-slave-status-relates-to-change-master-to/comment-page-1/#comment-324818 Baron Schwartz Tue, 08 Jul 2008 11:57:08 +0000 http://www.mysqlperformanceblog.com/?p=432#comment-324818 Peter, I think you're missing Paul's point: not only SHOW MASTER STATUS has a Master_Log_File column. SHOW SLAVE STATUS does too. And the value in SHOW SLAVE STATUS is the one that people wrongly use. Peter, I think you’re missing Paul’s point: not only SHOW MASTER STATUS has a Master_Log_File column. SHOW SLAVE STATUS does too. And the value in SHOW SLAVE STATUS is the one that people wrongly use.

]]> By: Erik http://www.mysqlperformanceblog.com/2008/07/07/how-show-slave-status-relates-to-change-master-to/comment-page-1/#comment-324729 Erik Tue, 08 Jul 2008 07:40:15 +0000 http://www.mysqlperformanceblog.com/?p=432#comment-324729 It's one of those niggley things which - as you say - is so very easy to do, but you feel ever so silly once you realise because it's really so obvious! A true "I need to wear shades and a baseball cap so no one can see it's me for the next six months"-moment. It’s one of those niggley things which – as you say – is so very easy to do, but you feel ever so silly once you realise because it’s really so obvious! A true “I need to wear shades and a baseball cap so no one can see it’s me for the next six months”-moment.

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