Event ID - 903

Event Id903
DescriptionCould not find row in sysindexes for clustered index on system catalog %ld in database ID %d. This index should exist in all databases. Run DBCC CHECKTABLE on sysindexes in the database.
Event InformationAccording to Microsoft

There are data consistency problems with at least one system table in the specified database. The problem could occur as a side effect of other data consistency issues. The problem could also be caused by manually adding or modifying an index on a system table or manually deleting a row from sysindexes. Note: Manual updates to system tables are not supported.
Run hardware diagnostics and correct any problems. Also examine the Microsoft Windows NT system and application logs and the SQL Server error log to see if the error occurred as the result of hardware failure. Fix any hardware related problems.
If you have persistent data inconsistency problems, try to swap out different hardware components to isolate the problem. Check that your system does not have write caching enabled on the disk controller. If you suspect this to be the case, contact your hardware vendor.
Finally, you might find it beneficial to switch to a completely new hardware system, including reformatting the disk drives and reinstalling the operating system.
If the problem is not hardware related and a known clean backup is available, restore the database from the backup.
If no clean backup is available, execute DBCC CHECKDB without a repair clause to determine the extent of the corruption. Since DBCC cannot fix system table errors, you will not be able to use the repair clause to fix this particular error.
CAUTION: If you are unsure what effect DBCC CHECKDB with a repair clause has on your data, contact your primary support provider before executing this statement.
If running DBCC CHECKDB with one of the repair clauses does not correct the problem, contact your primary support provider.
Reference LinksEvent Id:903 of Source Id:MSSQLServer

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