I have to do some updates on myisam tables which have around 20 M records. Our server has 24GB of ram and 2 quad core xeon with 24 MB of cache. I want to know how I can change the my.ini file so I get the best performance. I have windows 7 64 bit.
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You will need to check out the sum total of your indexes for MyISAM. Please run this query:
Whatever number comes out, use either that number or 8G, whichever is smaller.
MyISAM only caches index pages.
If you plan to migrate your data to InnoDB, use these settings: