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BUG #: 57706 (SQLBUG_70)
If multiple connections run concurrent single-row INSERT or UPDATE statements on a non-indexed table, although rare, the UPDATE might fail.
The UPDATE fails to complete with "0 rows affected" (and no other errors), when it should have succeeded, and the row is not updated.
Microsoft has confirmed this to be a problem in SQL Server 7.0. This problem has been corrected in U.S. Service Pack 3 for Microsoft SQL Server 7.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
274799For more information, contact your primary support provider.
(http://support.microsoft.com/kb/274799/ )INF: How to Obtain Service Pack 3 for Microsoft SQL Server 7.0 and Microsoft Data Engine (MSDE) 1.0
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