Comments on: MySQL 5.1 Stability

By: Florent Steiner

Florent Steiner — Wed, 22 Oct 2008 11:51:44 +0000

I have the very same problem on CentOS 5.6 x84_64 on a server with MyISAM tables.

So I guess it’s not because of FreeBSD.

Switching back to 5.0 tonight …

By: Andreas Müller

Andreas Müller — Wed, 02 Jul 2008 11:46:07 +0000

The problem seems to be verified and I hope it would be fixed soon. The leading bug report is http://bugs.mysql.com/bug.php?id=36259

It seems that there are 3 reports at the moment regarding to the same problem.

By: Sander

Sander — Wed, 02 Jul 2008 11:18:52 +0000

I had severe problems with MySQL 5.1 and FreeBSD back in February / March. This was on FreeBSD7 (Release), using InnoDB tables and a few MyISAM tables. And by severe I mean crashes and lockups every few minutes (!).

After the downgrade to 5.0, everything was running smooth again.

By: peter

peter — Tue, 01 Jul 2008 21:06:58 +0000

Andreas,

Indeed 5.1.25 in particular adds this “famous” optimizer regression.

I would be very careful with optimizer changes in RC stage – unlike normal “bugs” optimizer changes often make things better in some cases but worse in others and it is hard to predict the impact without wide user testing.

By: peter

peter — Tue, 01 Jul 2008 21:03:42 +0000

gslin,

Thanks for report, though MySQL 5.0 and 4.1 work OK for the same workload.

By: peter

peter — Tue, 01 Jul 2008 21:03:14 +0000

Mark,

Indeed it would be great to get some platform independent diagnostic tool to see where things are stuck.

By: Andreas Müller

Andreas Müller — Tue, 01 Jul 2008 11:32:19 +0000

I have also performance problems with 5.1.25
After some hours I found this optimizer/index problem: http://bugs.mysql.com/bug.php?id=37759

By: gslin

gslin — Tue, 01 Jul 2008 04:46:51 +0000

MyISAM with FreeBSD has been reported have scalability problem to mutex locking, both 6.3 and 7.0.

By: Mark Callaghan

Mark Callaghan — Tue, 01 Jul 2008 04:40:59 +0000

Too bad the MySQL server doesn’t provide the equivalent of SHOW INNODB STATUS so you can get more details on lock holders and waiters.

By: peter

peter — Tue, 01 Jul 2008 03:09:04 +0000

This was FreeBSD 6.3 I think

I could blame it on FreeBSD but I seen similar situation – queries locking in various states like “end” “freeing items” “Locked” etc on other systems.