Re: Server just hanging (More Information)
Hey Thomas -
Not sure how much time I'll have to go thru this, but wanted to let you know this was old style syntax for setting your variables:
set-variable = max_connections=300
I use this syntax:
max_connections=300
Also, I play with my variable settings on the fly. I have phpMyAdmin connection to my database (no login to the actually machine :( ). In phpMyAdmin I open a sql window and then type this:
SET GLOBAL max_connections=300;
When you set the key_buffer_size -- keep an eye on your server.
Here's some quick things I noticed until I can give this more indepth attention:
threads aren't being cached.
SET GLOBAL threads_cache = 64; <-- nice low number to start with!
I think your table cache (which I know can cause problems is a bit high if your ulimits and procs aren't unlimited) so bring this down. In the linux world 1240 is working for me, but looking at your stats I think 1000 might be better (you have 941 opened tables):
SET GLOBAL table_cache = 1000;
Some of your thread buffers are too high, others too low:
SET GLOBAL sort_buffer_size = 4194300;
SET GLOBAL read_buffer_size = 2097152;
SET GLOBAL read_rnd_buffer_size = 2097152;
SET GLOBAL join_buffer_size = 2097152;
And your key_buffer_size is too low for how much memory you have. Start with 256 MB and then run mysqlreport and see how much of your key_buffer you're using. If you're consistantly using 90%+ then raise it. Just a bit at a time:
SET GLOBAL key_buffer_size = 268440000;
Also mysqlreport will tell you how much of your query cache you're using. 100 mb is kinda low. You don't seem to be pruning (like I am!) but you also have a number of queries that aren't being cached. Do you use a lot of blob's in your tables?
I think 500MB for temp tables might be a bit high. I've got mine at 64MB. Maybe set it down and watch how many temp tables to disk you're writing. (mysqlreports will give you this info).
I'd try that.
It doesn't look like you're even close to using 300 max_connections. I'd try setting that to 100 for now.
I think a 500MB temp table size, with 300 max_connections throws you into a dangerous place. If you lower your thread buffers (and raise the too low ones a tiny bit) and keep your temp, query, key_buffers like you want -- you'll need about 10GB of RAM with 300 max_connections.
If you drop the 300 --> 100, lower your temp buffer a bit, raise your query cache a bit and put your key_buffer higher I think you'll be safer. Probably a MySQL engineer could better tweak this for Mac X, but these changes should get you started.
erin
Subject
Views
Written By
Posted
27286
August 11, 2005 11:25AM
23579
August 12, 2005 09:07AM
18897
August 12, 2005 01:06PM
18373
August 22, 2005 09:46AM
16454
August 24, 2005 03:27PM
12917
August 24, 2005 04:05PM
Re: Server just hanging (More Information)
13602
August 26, 2005 11:02AM
7382
August 26, 2005 11:05AM
6756
August 26, 2005 11:45AM
6543
August 26, 2005 05:46PM
6806
August 26, 2005 10:34PM
6414
August 25, 2005 01:08PM
5810
August 26, 2005 11:07AM
5620
August 27, 2005 09:09AM
5938
August 29, 2005 11:50AM
5864
August 29, 2005 12:04PM
5222
August 29, 2005 12:55PM
5106
August 29, 2005 05:26PM
5072
August 29, 2005 06:34PM
4712
August 29, 2005 08:40PM
4596
August 29, 2005 08:47PM
4455
August 29, 2005 09:00PM
4657
August 30, 2005 10:05AM
4533
August 30, 2005 10:18AM
5048
August 30, 2005 10:20AM
6070
August 29, 2005 08:53PM
4931
August 29, 2005 09:50PM
4767
August 29, 2005 10:01PM
5190
August 30, 2005 08:53AM
4625
August 30, 2005 11:22AM
5162
August 30, 2005 11:33AM
4826
August 30, 2005 11:59AM
24295
August 31, 2005 02:32PM
6461
August 31, 2005 02:49PM
5145
August 31, 2005 02:56PM
4999
August 31, 2005 03:06PM
8236
December 07, 2006 10:30AM
4943
August 31, 2005 03:10PM
4816
August 31, 2005 03:32PM
17654
August 31, 2005 07:15PM
5053
September 01, 2005 03:05AM
7774
September 15, 2005 04:31PM
5496
September 01, 2005 04:39AM
4401
September 08, 2005 09:53AM
4753
September 08, 2005 11:25AM
4537
September 26, 2005 11:52AM
4450
September 26, 2005 12:13PM
4385
September 27, 2005 09:55AM
4158
September 27, 2005 10:18AM
4057
September 28, 2005 10:29AM
4207
September 28, 2005 10:34AM
4373
September 28, 2005 10:52AM
4841
September 28, 2005 10:58AM
9610
September 23, 2005 01:56AM
4888
September 23, 2005 07:11AM
4879
October 05, 2005 04:58AM
5035
October 05, 2005 04:52PM
6071
October 05, 2005 11:49PM
5346
October 06, 2005 01:34AM
6650
October 06, 2005 04:57PM
4592
December 13, 2005 10:28AM
4578
December 13, 2005 10:34AM
4482
November 17, 2005 09:39AM
4847
January 08, 2007 12:12PM
4728
December 12, 2005 02:13PM
4567
December 14, 2005 11:43PM
4162
December 15, 2005 08:37AM
4231
December 15, 2005 11:18AM
4143
December 15, 2005 11:27AM
4269
December 15, 2005 11:32AM
4019
December 15, 2005 11:43AM
3972
December 15, 2005 11:43AM
4146
December 15, 2005 11:48AM
4023
December 15, 2005 11:51AM
4430
December 15, 2005 02:14PM
4082
December 15, 2005 02:18PM
3954
December 15, 2005 02:27PM
4429
December 15, 2005 02:43PM
4003
December 15, 2005 08:46AM
4992
January 26, 2006 12:38PM
4115
January 26, 2006 01:48PM
4197
January 26, 2006 01:48PM
3973
January 26, 2006 01:52PM
4121
January 27, 2006 04:46PM
3990
January 29, 2006 11:21AM
4330
January 30, 2006 09:42AM
4361
February 27, 2006 02:17PM
4056
February 27, 2006 02:23PM
4275
March 05, 2006 04:56AM
4098
March 06, 2006 08:09AM
4065
April 05, 2006 01:03PM
4249
September 27, 2006 08:43AM
4204
November 19, 2006 04:42AM
4346
December 14, 2006 05:45PM
4171
February 01, 2007 04:40AM
4839
November 11, 2007 01:24PM
5045
December 20, 2007 10:40AM
6478
January 21, 2008 10:14AM
5822
January 21, 2008 10:53AM
5279
May 19, 2008 09:41AM
5492
February 05, 2008 10:27AM
6034
March 12, 2008 08:37AM
5357
May 19, 2008 03:02AM
6097
November 14, 2008 12:31AM
7101
March 06, 2009 03:36PM