Re: multi-part index and when it is used?
Posted by:
James Day
Date: January 14, 2005 04:05PM
In addition to what Jonathan said, you might also experiment with the field order in a multi-column index. It can sometimes make a substantial difference.
Commencing with MySQL version 5.0.0 there is now some capability to use multiple indexes for a single instance of a table. See Index Merge Optimization
http://dev.mysql.com/doc/mysql/en/Index_Merge_optimization.html . It's still useful to consider the old rule though, because it's often applicable.
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Re: multi-part index and when it is used?
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