Comments on: SHOW INNODB STATUS walk through http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/ Percona's MySQL & InnoDB performance and scalability blog Sat, 11 Feb 2012 16:45:54 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Vaseeswaran http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/comment-page-1/#comment-885910 Vaseeswaran Mon, 06 Feb 2012 14:57:41 +0000 http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/#comment-885910 Thanks for the info!!! This is much useful. Thanks for the info!!!
This is much useful.

]]> By: Jason http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/comment-page-1/#comment-793628 Jason Wed, 12 Jan 2011 18:33:48 +0000 http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/#comment-793628 Will do. Thanks. Will do. Thanks.

]]> By: Peter Zaitsev http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/comment-page-1/#comment-793627 Peter Zaitsev Wed, 12 Jan 2011 18:31:17 +0000 http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/#comment-793627 Jason, Why do not you post your question in the forum and I will try to reply: http://forum.percona.com Jason,

Why do not you post your question in the forum and I will try to reply:
http://forum.percona.com

]]> By: Jason http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/comment-page-1/#comment-793625 Jason Wed, 12 Jan 2011 18:29:39 +0000 http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/#comment-793625 Great read Peter. We have a large database and buffer pool, with heavy read/write and we are seeing many semaphores like this: --Thread 1251916096 has waited at btr/btr0cur.c line 487 for 28.000 seconds the semaphore: S-lock on RW-latch at 0x2ac843e8e770 '&new_index->lock' a writer (thread id 1265760576) has reserved it in mode exclusive number of readers 0, waiters flag 1, lock_word: 0 Last time read locked in file btr/btr0cur.c line 487 Last time write locked in file btr/btr0cur.c line 480 The DB locks up for 10 seconds at a time, and disk activity drops to 0 and the mysql processlist shoots up as queries all appear to be locked. Then everything back to normal. I think it's buffer pool contention. Peter, do you have any experience with that? Great read Peter.

We have a large database and buffer pool, with heavy read/write and we are seeing many semaphores like this:

–Thread 1251916096 has waited at btr/btr0cur.c line 487 for 28.000 seconds the semaphore:
S-lock on RW-latch at 0x2ac843e8e770 ‘&new_index->lock’
a writer (thread id 1265760576) has reserved it in mode exclusive
number of readers 0, waiters flag 1, lock_word: 0
Last time read locked in file btr/btr0cur.c line 487
Last time write locked in file btr/btr0cur.c line 480

The DB locks up for 10 seconds at a time, and disk activity drops to 0 and the mysql processlist shoots up as queries all appear to be locked. Then everything back to normal. I think it’s buffer pool contention. Peter, do you have any experience with that?

]]> By: Jingqi Xu http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/comment-page-1/#comment-766283 Jingqi Xu Tue, 08 Jun 2010 10:12:47 +0000 http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/#comment-766283 Hi peter, should "History list length" <= "Trx id counter" - "Purge done for trx's n:o" ? Hi peter,

should “History list length” <= "Trx id counter" – "Purge done for trx's n:o" ?

]]> By: Jan http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/comment-page-1/#comment-723072 Jan Thu, 11 Feb 2010 08:48:21 +0000 http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/#comment-723072 In InnoDB is their a way to automatically rollback stale transactions, without the need to reboot the database? I'm thinking of a kind of time-out property, but can't seem to find a solution anywhere. In InnoDB is their a way to automatically rollback stale transactions, without the need to reboot the database?
I’m thinking of a kind of time-out property, but can’t seem to find a solution anywhere.

]]> By: Suresh Kuna http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/comment-page-1/#comment-705969 Suresh Kuna Tue, 05 Jan 2010 08:12:07 +0000 http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/#comment-705969 Useful info peter. Is the semaphores section specific to Innodb engine queries alone or any other which belongs to operating system and queries belongs to other engines also can effect this section. Thanks Suresh Kuna Useful info peter. Is the semaphores section specific to Innodb engine queries alone or any other which belongs to operating system and queries belongs to other engines also can effect this section.

Thanks
Suresh Kuna

]]> By: Lâmôlabs » Delicious Bookmarks for June 15th from 13:58 to 14:27 http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/comment-page-1/#comment-586305 Lâmôlabs » Delicious Bookmarks for June 15th from 13:58 to 14:27 Mon, 15 Jun 2009 19:58:01 +0000 http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/#comment-586305 [...] SHOW INNODB STATUS walk through | MySQL Performance Blog – June 15th ( tags: mysql innodb performance tuning database status monitoring reference ) [...] [...] SHOW INNODB STATUS walk through | MySQL Performance Blog – June 15th ( tags: mysql innodb performance tuning database status monitoring reference ) [...]

]]> By: 书童的涂鸦板 » Blog Archive » 详解show innodb status http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/comment-page-1/#comment-565486 书童的涂鸦板 » Blog Archive » 详解show innodb status Sat, 23 May 2009 01:31:34 +0000 http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/#comment-565486 [...] (翻译了mysqlperformance blog的文章，网址为http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/，英文不好，大家见笑) [...] [...] (翻译了mysqlperformance blog的文章，网址为http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/，英文不好，大家见笑) [...]

]]> By: Pranab http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/comment-page-1/#comment-356341 Pranab Fri, 19 Sep 2008 05:17:29 +0000 http://www.mysqlperformanceblog.com/2006/07/17/show-innodb-status-walk-through/#comment-356341 Thanks for the info. Regards, Pranab www.goguwahati.com Thanks for the info.
Regards,
Pranab
http://www.goguwahati.com

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