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
Subject
Views
Written By
Posted
6301
September 02, 2005 12:39PM
2943
September 02, 2005 02:01PM
3203
September 02, 2005 02:25PM
2924
September 02, 2005 03:38PM
2783
September 06, 2005 09:17PM
2800
September 05, 2005 12:03PM
2836
September 06, 2005 09:18PM
2773
September 04, 2005 07:21PM
2781
September 06, 2005 09:14PM
2984
September 06, 2005 09:22PM
2718
September 06, 2005 11:17PM
2722
September 07, 2005 02:54AM
Re: 2 column between optimization
3096
September 07, 2005 02:48AM
2874
September 07, 2005 12:25PM
2678
September 07, 2005 12:54PM
Sorry, you can't reply to this topic. It has been closed.
Content reproduced on this site is the property of the respective copyright holders.
It is not reviewed in advance by Oracle and does not necessarily represent the opinion
of Oracle or any other party.