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mssqlserver-8993-database-engine-error.md

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title description author ms.author ms.date ms.service ms.subservice ms.topic helpviewer_keywords
MSSQLSERVER_8993
MSSQLSERVER_8993
MashaMSFT
mathoma
04/04/2017
sql
supportability
reference
8993 (Database Engine error)

MSSQLSERVER_8993

[!INCLUDE SQL Server]

Details

Attribute Value
Product Name SQL Server
Event ID 8993
Event Source MSSQLSERVER
Component SQLEngine
Symbolic Name DBCC3_MISSING_FORWARDED_ROW
Message Text Object ID O_ID, forwarding row page P_ID1, slot S_ID1 points to page P_ID2, slot S_ID2. Did not encounter forwarded row. Possible allocation error.

Explanation

A forwarding row in a heap points to a nonexistent forwarded row.

User Action

Look for Hardware Failure

Run hardware diagnostics and correct any problems. Also examine the [!INCLUDEmsCoName] Windows system and application logs and the [!INCLUDEssNoVersion] error log to see whether the error occurred as the result of hardware failure. Fix any hardware-related problems that are contained in the logs.

If you have persistent data corruption problems, try to swap out different hardware components to isolate the problem. Check to make sure that the system does not have write-caching enabled on the disk controller. If you suspect write-caching to be the problem, contact your hardware vendor.

Finally, you might find it useful to switch to a new hardware system. This switch may include reformatting the disk drives and reinstalling the operating system.

Restore from Backup

If the problem is not hardware related and a known clean backup is available, restore the database from the backup.

Run DBCC CHECKDB

If no clean backup is available, run DBCC CHECKDB without a REPAIR clause to determine the extent of the corruption. DBCC CHECKDB will recommend a REPAIR clause to use. Then, run DBCC CHECKDB with the appropriate REPAIR clause to repair the corruption.

Caution

If you are not sure what effect DBCC CHECKDB with a REPAIR clause has on your data, contact your primary support provider before running this statement.

If running DBCC CHECKDB with one of the REPAIR clauses does not correct the problem, contact your primary support provider.

Results of Running REPAIR Options

The forwarding row will be deleted and any nonclustered indexes will be rebuilt.