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SQL Query

Posted on 2011-03-21
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Last Modified: 2012-05-11
I have a SQL Query that takes some time to return answer.  Is there a way to speed up the response?
The table has about 5,000,000 rows of data.

SELECT vol FROM tblVolDelta13_18 WHERE [deltaId] = '50' and [loadTime] = '25200' and [expiryId] = '2' and [loadDate] = '40623'

Generally, the idea is to retreive the vol data for the latest date.  Running this query does take about 30 seconds to retreive the answer.

Thanks,
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Question by:blueteam
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by:ewangoya
ewangoya earned 25 total points
ID: 35184354

It may just be a case of indexes

Are all the fields in your where clause indexed
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Accepted Solution

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Roman Gherman earned 25 total points
ID: 35184369
Hi,
You're doing checking for a string, why is that?
I think that those columns which you're filtering by are integers, aren't they?

I think the code should look like this:
SELECT vol FROM tblVolDelta13_18 WHERE [deltaId] = 50 and [loadTime] = 25200 and [expiryId] = 2 and [loadDate] = 40623

Open in new window


Plus try adding indexes where possible.
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Expert Comment

by:Mohamed Abowarda
ID: 35185747
Check the database columns data type, probably you are using varchar instead of int, you should also update the query and remove the quotations to query about integers.
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Expert Comment

by:PagodNaUtak
ID: 35186953
Or you can use paging for this scenario.

Have a look here:

http://forums.devx.com/showthread.php?t=155210
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