|Message:||Table error: alloc unit ID %I64d, page %S_PGID contains an incorrect page ID in its page header. The PageId in the page header = %S_PGID.|
The page header of page P_ID1 contains an incorrect page ID, P_ID2.
MSSQLEngine_5256 is similar to error MSSQLEngine_8909, but 5256 has occurred on a page of one of the following system base tables: sysallocunits, sysrowsets, syshobts, syshobtcolumns, or sysrowsetcolumns. Because it is unsafe to use this metadata, this error contains less contextual information about the page, such as object name, object ID, and index ID.
Look for Hardware Failure
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.
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
Not applicable. This error cannot be repaired because the error occurs in one of the core SQL Server storage-engine system base tables. If you cannot restore the database from a backup, contact Microsoft Customer Service and Support (CSS).