Re: Server just hanging (Copying to tmp table)
There is something DEFINITELY related to open files. I don't see that MySQL is calling ulimit -n xxxx anywhere but I did add it to my script. I actually added "ulimit -n unlimited" and I see my open files limit is 12288 which is the number ulimit puts it to when running that command. I'm getting ahead of myself though. I'll tell you what happened to me this morning (at this point I hadn't added ulimit to the startup script).
Got a page at 6am. My servers were not responding again. I figured it was the server but I decided to take the opportunity to debug. This time I noticed it wasn't hung queries, it's that connections could not be made to the server. Mysqlreport said:
__ Tables ______________________________________________________________
Open 1.23k of 2400 %Cache: 51.42
Opened 6.71k 0.02/s
I checked ulimit -a and it was set to 1024 for "-n" but earlier yesterday I set that to unlimited so something changed it back! (Automated process somehow?)
when I set it to unlimited again on the command line connections started coming through. I found that interesting. Although on one site the server said that I must run "mysqladmin flush-hosts" in order to connect because there were too many concurrent connections (mysql report still listed only 198 out of 300 total connections used)
So, I ran flush-hosts and that allowed that site in and things started running nicer for a few minutes. Then things bogged down again and people couldn't connect (literally about 4 minutes later) I as confused as to why this happened so I checked ulimit again and it was still 12288. I checked mysql report and it was pretty much the same. I logged into the server and flushed tables and things started running smoothly again.
I noticed in sysctl that kern.maxfiles was set to 12288 so I thought this was related to ulimit -n being set to that max. (although I thought at the time ulimit was setting kern.maxfiles but I think that is the other way around) So, I set kern.maxfiles in sysctl.conf to 12288 and rebooted. I found that the server was still running with a ulimit of 1024 unless I manually changed it. So I added "ulimit -n unlimited" to the MySQL server startup script. And I now see what I reported to you at the top.
I think my server hit max files for some reason. I'm going to play around here and see what I can find out.
I know enough to be dangerous. Thanks for being patient!
Subject
Views
Written By
Posted
27045
August 11, 2005 11:25AM
23481
August 12, 2005 09:07AM
18828
August 12, 2005 01:06PM
18308
August 22, 2005 09:46AM
16372
August 24, 2005 03:27PM
12844
August 24, 2005 04:05PM
13533
August 26, 2005 11:02AM
7305
August 26, 2005 11:05AM
6680
August 26, 2005 11:45AM
6466
August 26, 2005 05:46PM
6738
August 26, 2005 10:34PM
6322
August 25, 2005 01:08PM
5739
August 26, 2005 11:07AM
5564
August 27, 2005 09:09AM
5872
August 29, 2005 11:50AM
5800
August 29, 2005 12:04PM
5134
August 29, 2005 12:55PM
5032
August 29, 2005 05:26PM
4991
August 29, 2005 06:34PM
4631
August 29, 2005 08:40PM
4498
August 29, 2005 08:47PM
4383
August 29, 2005 09:00PM
4589
August 30, 2005 10:05AM
4418
August 30, 2005 10:18AM
4988
August 30, 2005 10:20AM
6008
August 29, 2005 08:53PM
4878
August 29, 2005 09:50PM
4683
August 29, 2005 10:01PM
5089
August 30, 2005 08:53AM
4553
August 30, 2005 11:22AM
5093
August 30, 2005 11:33AM
4759
August 30, 2005 11:59AM
24230
August 31, 2005 02:32PM
6392
August 31, 2005 02:49PM
5095
August 31, 2005 02:56PM
4926
August 31, 2005 03:06PM
8149
December 07, 2006 10:30AM
4880
August 31, 2005 03:10PM
4753
August 31, 2005 03:32PM
17579
August 31, 2005 07:15PM
4976
September 01, 2005 03:05AM
7715
September 15, 2005 04:31PM
Re: Server just hanging (Copying to tmp table)
5429
September 01, 2005 04:39AM
4317
September 08, 2005 09:53AM
4676
September 08, 2005 11:25AM
4485
September 26, 2005 11:52AM
4378
September 26, 2005 12:13PM
4327
September 27, 2005 09:55AM
4086
September 27, 2005 10:18AM
3984
September 28, 2005 10:29AM
4143
September 28, 2005 10:34AM
4297
September 28, 2005 10:52AM
4781
September 28, 2005 10:58AM
9551
September 23, 2005 01:56AM
4812
September 23, 2005 07:11AM
4814
October 05, 2005 04:58AM
4801
October 05, 2005 04:52PM
5993
October 05, 2005 11:49PM
5288
October 06, 2005 01:34AM
6572
October 06, 2005 04:57PM
4520
December 13, 2005 10:28AM
4513
December 13, 2005 10:34AM
4418
November 17, 2005 09:39AM
4780
January 08, 2007 12:12PM
4677
December 12, 2005 02:13PM
4505
December 14, 2005 11:43PM
4088
December 15, 2005 08:37AM
4172
December 15, 2005 11:18AM
4071
December 15, 2005 11:27AM
4199
December 15, 2005 11:32AM
3958
December 15, 2005 11:43AM
3903
December 15, 2005 11:43AM
4066
December 15, 2005 11:48AM
3944
December 15, 2005 11:51AM
4357
December 15, 2005 02:14PM
4015
December 15, 2005 02:18PM
3875
December 15, 2005 02:27PM
4368
December 15, 2005 02:43PM
3945
December 15, 2005 08:46AM
4928
January 26, 2006 12:38PM
4057
January 26, 2006 01:48PM
4139
January 26, 2006 01:48PM
3902
January 26, 2006 01:52PM
4056
January 27, 2006 04:46PM
3903
January 29, 2006 11:21AM
4263
January 30, 2006 09:42AM
4299
February 27, 2006 02:17PM
3990
February 27, 2006 02:23PM
4215
March 05, 2006 04:56AM
4036
March 06, 2006 08:09AM
3997
April 05, 2006 01:03PM
4187
September 27, 2006 08:43AM
4139
November 19, 2006 04:42AM
4292
December 14, 2006 05:45PM
4103
February 01, 2007 04:40AM
4766
November 11, 2007 01:24PM
4984
December 20, 2007 10:40AM
6353
January 21, 2008 10:14AM
5748
January 21, 2008 10:53AM
5202
May 19, 2008 09:41AM
5421
February 05, 2008 10:27AM
5946
March 12, 2008 08:37AM
5271
May 19, 2008 03:02AM
6022
November 14, 2008 12:31AM
7050
March 06, 2009 03:36PM