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Re: 2 column between optimization
Posted by: Jay Pipes
Date: September 07, 2005 02:48AM

What's the result of the left-side of the index's cardinality? In other words, what does this return:

Select Count(*) from geo_feature where latitude BETWEEN .06494 and 0.7384

?

If that number ~ >= ( 235K * .35) then it will have a tough time using the index, as the left side of the index isn't helping the optimizer.

Jay Pipes
Community Relations Manager, North America, MySQL Inc.

Got Cluster? http://www.mysql.com/cluster
Personal: http://jpipes.com

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