Comments on: MySQL Server Memory Usage

By: Baron Schwartz

Baron Schwartz — Tue, 27 Sep 2011 13:17:53 +0000

Moses, please use the forums and don’t double-comment on more blog posts.

By: moses

moses — Tue, 27 Sep 2011 08:42:04 +0000

hi peter,

I would like to run MySQL5.5.14 with InnoDB ONLY, plus PHP 5.2, Apache 2.2 and Memcached on the SAME box.

The specs are:

Operating System: Debian GNU/Linux 5.0 Lenny/Stable (64 bit)
Dual Processor Quad Core Xeon 2 x 4MB cache (2.0Ghz)
2 X 250GB SATA II HDD
12 GB DDR3 RAM

My question is: how much RAM should i give to MySQL? 4GB? 6GB? 3GB? Please advise.

Many thanks in advance….

By: Mehri

Mehri — Mon, 07 Feb 2011 21:10:34 +0000

Hi Peter,

Could you plz say that which configuration for mysql is the best for a server with 16GB memory, while we want to mysql not uses more than 12GB of all!

By: Peter Zaitsev

Peter Zaitsev — Fri, 28 Jan 2011 04:00:40 +0000

Liwen,

How much VSZ do you get for MySQL in this case? When you have 30000 connections there can be significant amount of memory allocated per connection, which can also be tuned by adjusting various per thread buffers

By: Liwen

Liwen — Thu, 27 Jan 2011 18:39:17 +0000

Hello,
I have a 64GB server, innodb buffer pool set to 40GB or less, use innodb_flush_method = O_DIRECT, 2X8GB innodb log, and has 30000 connections with 20 thread pool worker threads. It ran out of free memory and got heavy swap at the same time OS cache is 12GB. What’s the possible reason the redhat linux 5 can’t use the 12GB cache, but use swap instead?
Thanks.

By: Taxi

Taxi — Mon, 22 Feb 2010 16:07:16 +0000

Hi,
Are there any easy to implement rules as to what paramaters to set based on server memory size and number/types of databases and tables?

By: Edugeek Database - Page 2

Edugeek Database - Page 2 — Thu, 13 Aug 2009 18:16:52 +0000

[...] magically Looks like it is configurable in the mysqld service config, here are some guides: MySQL Server Memory Usage | MySQL Performance Blog MySQL :: MySQL 5.0 Reference Manual :: 7.5.8 How MySQL Uses Memory Troubleshooting Memory Usage – [...]

By: Sanjay

Sanjay — Wed, 27 May 2009 15:20:41 +0000

Hello,

I’m running MySQL 5.1.33 for Solaris 8. The insert speed is about 2300 rows/sec at 240Kb/s. Is it the normal speed or par below the standard? I’m quite a newbie hence the question.

By: Yong Ji

Yong Ji — Sun, 05 Apr 2009 16:54:32 +0000

What’s the difference between innodb table cache and Memory pool?

By: Yong Ji

Yong Ji — Fri, 03 Apr 2009 19:38:02 +0000

Is “MyISAM buffers” stated in the “List of rarely considered MySQL Server Memory Requirements” from the key buffer?
If so, would explain more about the difference?
Thank you,