Microsoft KB Archive/151408

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BUG: Query w/ Group by All Can Take Too Long to Complete

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Q151408

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The information in this article applies to:


 * Microsoft SQL Server version 6.0

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BUG# 12809 (6.00)

SYMPTOMS
The time a query takes to produce output can be too long when using join(s) between two or more tables and a GROUP BY ALL. The scan count and physical IO count are extremely high. The tables involved in the join have lots of duplicate data in the column involved and does not have any indexes.

Testing has shown that the situation under which this problem has been encountered is narrow in scope, and the problem can be reproduced only with the provided replication data.

WORKAROUND
Reduce the duplicates and create appropriate index(s) to reduce the amount of time to produce the output.

STATUS
Microsoft has confirmed this to be a problem in Microsoft SQL Server Version 6.0. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

This problem does not happen in SQL Server 6.5.

Keywords : kbusage

Issue type :

Technology : kbSQLServSearch kbAudDeveloper kbSQLServ600