MySQL Forums
Forum List  »  Optimizer & Parser

Re: 2 column between optimization
Posted by: Felix Geerinckx
Date: September 02, 2005 02:01PM

Brad Culberson wrote:

> I need to optimize queries similar to the following:
> Select * from thattable where a > 1 and a < 2 and b > 3 and b < 5
>
> After making an index including both a and b in ascending order, Explain shows it is not being
> used...
>
> As a test, I also tried to add index just a and doing the following:
> Select * from thattable where a > 1 and a < 2
> Explain also shows it is also not being used.
>
> Any ideas would be greatly appreciated.

Can you post the output of:

SELECT VERSION();
SHOW CREATE TABLE thattable;
SHOW INDEX FROM thattable\G
EXPLAIN SELECT ... \G

--
felix
Please use BBCode to format your messages in this forum.

Options: ReplyQuote


Subject
Views
Written By
Posted
5905
September 02, 2005 12:39PM
Re: 2 column between optimization
2706
September 02, 2005 02:01PM
2864
September 02, 2005 02:25PM
2709
September 02, 2005 03:38PM
2549
September 06, 2005 09:17PM
2537
September 05, 2005 12:03PM
2604
September 06, 2005 09:18PM
2548
September 04, 2005 07:21PM
2545
September 06, 2005 09:14PM
2710
September 06, 2005 09:22PM
2491
September 06, 2005 11:17PM
2496
September 07, 2005 02:54AM
2857
September 07, 2005 02:48AM
2661
September 07, 2005 12:25PM
2449
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.