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Re: subquery vs. join?
Posted by: Magnus Olsson
Date: January 20, 2005 06:52AM

When executing such a query I analyze the used amount of memory and the current CPU-usage in the windows task manager. The CPU-usage is only ca 10% and memory usage around 60% when executing the join, that indicates that the system doesn't suffer from insufficient system resources, doesn't it?.

When I examine the thread of the join query in MySQL Administrator it seems to do a lot of "copying to temporary table". Is there a variable that can be adjusted so it performs more operations in RAM memory?

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