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Controlling memory usage under Win32: query_cache_size or innodb_buffer_pool_siz

Controlling memory usage under Win32: query_cache_size or innodb_buffer_pool_siz

2004-12-21       - By Patrick Questembert

 Back
When I run large queries, mysqlnt.exe gets to around 150MB of memory usage,
which brings my WinXP server to a near stand-still and other apps are barely
able to run ...

This is on Windows XP, MySQL Server 4.1, 1GB of memory, all tables InnoDB. I
am running 3 MySQL apps (which are not querying lots of data, just writing)
and one app querying a large number of rows.

I haven't tuned my MYSQL server performance just yet so would appreciate
some guidance to avoid tuning the wrong parameter ... which of the size
parameters do I need to change for this situation?

I assume I need to edit \Program Files\MySQL\MySQL Server 4.1\my.cnf
The size parameters mentioned there in relation to InnoDB tables are:
query_cache_size=33M
tmp_table_size=16M (not sure if this is relevant for apps which don't create
in-memory tables explicitely)
innodb_additional_mem_pool_size=2M (recommended not to change this value)
innodb_log_buffer_size=1M
innodb_buffer_pool_size=93M
innodb_log_file_size=19M

At first glance, query_cache_size=33M or innodb_buffer_pool_size=93M seem
like the parameters I need to tune down. Question is which one? In-line
documentation of both parameters seem to indicate an overlap in purpose ...
does innodb_buffer_pool_size supercede query_cache_size for InnoDB tables?

Thanks!
Patrick Questembert


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