Comments on: MySQL Memory Consumption http://www.pythian.com/news/1455/mysql-memory-consumption/ News and views from Pythian DBAs Fri, 10 Feb 2012 13:01:25 +0000 hourly 1 http://wordpress.org/?v=3.0.4 By: MySQL Memory Usage « HOBALL ??? http://www.pythian.com/news/1455/mysql-memory-consumption/#comment-380456 MySQL Memory Usage « HOBALL ??? Sat, 24 Oct 2009 02:25:51 +0000 http://www.pythian.com/blogs/1455/mysql-memory-consumption#comment-380456 [...] http://www.pythian.com/news/1455/mysql-memory-consumption Leave a [...] [...] http://www.pythian.com/news/1455/mysql-memory-consumption Leave a [...]

]]> By: Shlomi Noach http://www.pythian.com/news/1455/mysql-memory-consumption/#comment-333697 Shlomi Noach Tue, 27 Jan 2009 07:11:46 +0000 http://www.pythian.com/blogs/1455/mysql-memory-consumption#comment-333697 Hi, Well, it says so here: http://dev.mysql.com/doc/refman/5.1/en/ Regards max_tmp_tables Option Sets Variable Yes, max_tmp_tables Variable Name max_tmp_tables Variable Scope Both Dynamic Variable Yes Value Set Type numeric Default 32 Range 1-4294967295 The maximum number of temporary tables a client can keep open at the same time. (This option does not yet do anything.) Hi,

Well, it says so here:
http://dev.mysql.com/doc/refman/5.1/en/

Regards

max_tmp_tables
Option Sets Variable Yes, max_tmp_tables
Variable Name max_tmp_tables
Variable Scope Both
Dynamic Variable Yes
Value Set
Type numeric
Default 32
Range 1-4294967295

The maximum number of temporary tables a client can keep open at the same time. (This option does not yet do anything.)

]]> By: Keith Murphy http://www.pythian.com/news/1455/mysql-memory-consumption/#comment-333535 Keith Murphy Mon, 26 Jan 2009 15:40:26 +0000 http://www.pythian.com/blogs/1455/mysql-memory-consumption#comment-333535 Shlomi, First of all..thanks!! You are absolutely right about the maximum number of temp tables. I had looked that at up at some point in writng the formula but forgot to update it evidently. I really wish that max_tmp_tables would be implemented max so you could know exactly how much could be used by temporary tables. I completely forgot about binlog cache. Thanks! Shlomi,

First of all..thanks!!

You are absolutely right about the maximum number of temp tables. I had looked that at up at some point in writng the formula but forgot to update it evidently. I really wish that max_tmp_tables would be implemented max so you could know exactly how much could be used by temporary tables.

I completely forgot about binlog cache. Thanks!

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]]> By: Shlomi Noach http://www.pythian.com/news/1455/mysql-memory-consumption/#comment-333169 Shlomi Noach Sun, 25 Jan 2009 05:58:02 +0000 http://www.pythian.com/blogs/1455/mysql-memory-consumption#comment-333169 Hi! Good post. Still missing from the formula is the memory consumed by memory tables (number of memory tables * max_heap_table_size). Also, there is no actual limit to the number of temporary tables. The comments for max_tmp_tables says: ...The maximum number of temporary tables a client can keep open at the same time. (This option does not yet do anything.) ... And last one I can think of is binlog_cache_size, which may be allocated per connection if using transactional engines, so this one goes inside the "max_connections * (...)" formula. Regards, Shlomi Hi!

Good post.
Still missing from the formula is the memory consumed by memory tables (number of memory tables * max_heap_table_size).

Also, there is no actual limit to the number of temporary tables. The comments for max_tmp_tables says:
…The maximum number of temporary tables a client can keep open at the same time. (This option does not yet do anything.) …

And last one I can think of is binlog_cache_size, which may be allocated per connection if using transactional engines, so this one goes inside the “max_connections * (…)” formula.

Regards,
Shlomi

]]> By: Seun Osewa http://www.pythian.com/news/1455/mysql-memory-consumption/#comment-332961 Seun Osewa Sat, 24 Jan 2009 14:52:12 +0000 http://www.pythian.com/blogs/1455/mysql-memory-consumption#comment-332961 I always use the minimum number of connections I can get away with. Just my two cents. I always use the minimum number of connections I can get away with. Just my two cents.

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