FIX: Keyset, Dynamic and Forward Only Cursor Queries May not Get Auto-Parameterized (248688)
The information in this article applies to:
This article was previously published under Q248688
BUG #: 56070 (SQLBUG_70)
SYMPTOMS
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.
CAUSE
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.
STATUS
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.
MORE INFORMATION
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.
| Modification Type: | Major | Last Reviewed: | 3/14/2006 |
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| Keywords: | kbBug kbfix KB248688 |
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