Microsoft KB Archive/135350

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FIX: DBCC NEWALLOC May Not Detect TEXT Extent Inconsistencies

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Q135350

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The information in this article applies to:


 * Microsoft SQL Server versions 4.2, 6.0

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BUG# NT: 11026 (4.20)

SYMPTOMS
The DBCC NEWALLOC commmand may not detect extent chain inconsistencies if the problem is on TEXT or IMAGE chains.

CAUSE
The DBCC NEWALLOC command traverses extent chains for all indexes of a table, but does not check the extent chains for indid = 255, which is the number used for TEXT and IMAGE chains. Inconsistencies of this type are also not detectable with the DBCC TEXT_AL or DBCC TEXT_ALLOC commands. DBCC CHECKALLOC does correctly detect and report TEXT extent chain problems.

WORKAROUND
Use the DBCC CHECKALLOC command in addition to or in place of DBCC NEWALLOC if you have TEXT or IMAGE columns.

STATUS
Microsoft has confirmed this to be a problem in Microsoft SQL Server version 6.0. This problem was corrected in Service Pack 2 for SQL Server version 6.0. For more information, contact your primary support provider.

Additional query words: sql6 tsql

Keywords : kbprogramming

Issue type : kbbug

Technology : kbSQLServSearch kbAudDeveloper kbSQLServ600