Microsoft KB Archive/165510

= FIX: Numeric and Decimal Datatypes Do Not Always Use an Index =

Article ID: 165510

Article Last Modified on 3/14/2006

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APPLIES TO


 * Microsoft SQL Server 6.5 Standard Edition

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This article was previously published under Q165510



BUG #: 16301 (SQLBUG_65)



SYMPTOMS
A query can be very slow if the qualifying column used in the where clause is either a numeric or decimal data type. The query can be slow even if the columns have indexes. A show plan of the query shows that the optimizer chooses to do a table scan rather than use the index.

This problem only occurs in Microsoft SQL Server version 6.5 Service Pack 2. Earlier versions of SQL Server do not have this problem.



WORKAROUND
Change your query to use another column as the qualifier, or use a composite index with the first part of the index key not being a decimal or numeric data type. Another workaround is to change the qualifying column used in the where clause to truly be numeric or decimal. For example, instead of using 9, use 9.0, or do a convert to numeric or decimal.



STATUS
Microsoft has confirmed this to be a problem in SQL Server 6.5. This problem has been corrected in Service Pack 5a for Microsoft SQL Server 6.5.For more information, click the following article number to view the article in the Microsoft Knowledge Base:

197177 INF: How to Obtain SQL Server 6.5 Service Pack 5a

For more information, contact your primary support provider.

Keywords: kbbug kbfix kbusage KB165510

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