Microsoft KB Archive/248688

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FIX: Keyset, Dynamic and Forward Only Cursor Queries May not Get Auto-Parameterized

Article ID: 248688

Article Last Modified on 3/14/2006


  • Microsoft SQL Server 7.0 Standard Edition

This article was previously published under Q248688

BUG #: 56070 (SQLBUG_70)


Applications that repetitively run non-parameterized but similar queries through a keyset, dynamic or forward only cursor may experience slower performance than if the same queries were run with a different cursor type.


When submitted through the cursor, the queries are not being auto-parameterized. As a result, every query is compiled individually, resulting in a longer aggregate execution time than expected.


Microsoft has confirmed this to be a problem in SQL Server 7.0. This problem has been corrected in U.S. Service Pack 2 for Microsoft SQL Server 7.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

254561 INF: How to Obtain Service Pack 2 for Microsoft SQL Server 7.0 and Microsoft Data Engine (MSDE) 1.0

For more information, contact your primary support provider.


With this fix installed, the query plan is auto-parameterized on the first run, increasing the performance of subsequent runs once the plan is in cache.

Additional query words: parameter marker optimization compile

Keywords: kbbug kbfix KB248688