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6.7

Most efficient way to query table WHERE DateTime > value, index not being used?

Asked by Solar_Flare in SQL Server 2008, .NET, MS SQL Server

Tags: SQL

SQL Server 2008 - bit of a newbie to managing and optimizing SQL Server...

I have a table that will contain many records and will continue to grow over time by maybe up to 30K rows per month.

Two of the columns on this table are the start datetim and finish datetime for that record. In my application I will regularly be fetching records for a specific datetime such as the last 30 days.

If I look at the query executio nplan for a query such as

SELECT * FROM table WHERE FinishDate > DATEADD(day, -30, GETDATE())
OR
SELECT * FROM table WHERE FinishDate > @D1

then I notice that even if I have an index on the date column SQL Server 2008 does not use it. (it suggests adding an index with all the other columns as Included Columns which makes the index stupidly huge)

Should I be concerned that performance will degrade as the table grows - if it's not using the index then will it take longer to query each month as the table grows?

can I get SQL Server 2008 to use an index when using > or < on a date field?
[+][-]09/11/08 08:13 PM, ID: 22456871Accepted Solution

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Zones: SQL Server 2008, .NET, MS SQL Server
Tags: SQL
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Solution Provided By: knightEknight
Participating Experts: 3
Solution Grade: B
 
[+][-]09/11/08 08:14 PM, ID: 22456879Expert Comment

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[+][-]09/11/08 08:45 PM, ID: 22457001Author Comment

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[+][-]09/12/08 05:31 AM, ID: 22459032Expert Comment

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[+][-]09/12/08 04:50 PM, ID: 22464834Expert Comment

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[+][-]09/12/08 05:24 PM, ID: 22465002Assisted Solution

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