Article ID: 298643 - View products that this article applies to.
This article was previously published under Q298643
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BUG #: 101661 (SQLBUG_70)
The SQL Server optimizer may fail to accurately estimate how many rows will qualify for an expression of the form [column] = [value] if the following conditions are true:
If the first two steps (and only the first two) of the histogram have the same value, the optimizer could fail to detect that this is a frequent value.
To resolve this problem, obtain the latest service pack for Microsoft SQL Server 7.0. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
301511NOTE: The following hotfix was created prior to Microsoft SQL Server 7.0 Service Pack 4.
(https://support.microsoft.com/kb/301511/EN-US/ )INF: How to Obtain the Latest SQL Server 7.0 Service Pack
The English version of this fix should have the following file attributes or later:
NOTE: Because of file dependencies, the most recent hotfix or feature that contains the preceding files may also contain additional files.
Version File name -------------------------- 7.00.994 Sqlservr.exe 7.00.994 Sqlsort.dll
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft SQL Server 7.0 Service Pack 4.
You can use DBCC SHOW_STATISTICS to view the historgam for the index being used.