Table error: page %S_PGID allocated to object ID %d, index ID %d, partition ID %I64d, alloc unit ID %I64d (type %.*ls) was not seen. The page may be invalid or may have an incorrect alloc unit ID in its header.

Details
Product: SQL Server
Event ID: 2533
Source: MSSQLServer
Version: 9.00.1281.60
Symbolic Name: DBCC_PAGE_WAS_NOT_SEEN
Message: Table error: page %S_PGID allocated to object ID %d, index ID %d, partition ID %I64d, alloc unit ID %I64d (type %.*ls) was not seen. The page may be invalid or may have an incorrect alloc unit ID in its header.
   
Explanation

A page is allocated to the allocation unit ID, A_ID, but this allocation unit ID is not in the header of the page. The header has a different allocation unit ID. If the allocation unit ID in the header of the page is for a valid object, the page may have a matching MSSQLEngine_2534 error.

Possible Causes

This error can be caused by one of the following problems:

  • A random page corruption.

  • A bug in the page formatting.

  • A bug in recovery.

  • A bit may have been set incorrectly in one of the Index Allocation Map (IAM) pages for the allocation unit ID, A_ID. An incorrectly set bit means that a complete extent has been incorrectly allocated to this allocation unit. If there is an incorrectly set bit, you might see up to seven more MSSQLEngine_2533 errors from pages in the same extent.

   
User Action

Run hardware diagnostics and correct any problems. Also examine the Microsoft Windows system and application logs and the SQL Server 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.

Results of Running REPAIR Options

REPAIR will deallocate the page. If the page was from an in-row data allocation unit, the index, if one exists, will be rebuilt.

This repair may cause data loss.

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