Corruption of SQL Server Database having nonclustered index

Corruption of SQL Server Database having nonclustered index

In SQL Server database, the non-clustered indexes shows that the rows are sorted in an order. These represent the messing up of the row data storage and the leaf layer of these indexes is made up of index pages in place of data pages. Their B-tree structure is same as of clustered ones.

The database having these indexes can sometimes report corruption, with the following entry in the Error log:

Date Time SPID SQL Server Assertion: File: , line=3436 Failed Assertion = IsValidSlot (sid). This error may be timing-related. If the error persists after rerunning the statement, use DBCC CHECKDB to check the database for structural integrity, or restart the server to ensure in-memory data structures are not corrupted.
Date Time SPID Error: 3624, Severity: 20, State: 1.
Date Time SPID A system assertion check has failed. Check the SQL Server error log for details. Typically, an assertion failure is caused by a software bug or data corruption. To check for database corruption, consider running DBCC CHECKDB. If you agreed to send dumps to Microsoft during setup, a mini dump will be sent to Microsoft. An update might be available from Microsoft in the latest Service Pack or in a QFE from Technical Support.
Date Time SPID Error: 3314, Severity: 21, State: 1.
Date Time SPID During undoing of a logged operation in database odstjm, an error occurred at log record ID (82:641734:321). Typically, the specific failure is logged previously as an error in the Windows Event Log service. Restore the database or file from a backup, or repair the database.

This error is particularly encountered when the user attempts to update the table which possesses the non-clustered database. The error suggests that the database is facing corruption.


The in-depth search tells that if the allow_page_locks option has been disabled somehow then the problem can be encountered. If the table doesnt have any clustered index, then the corruption can be seen in the database.


One of the best cures is to restore it back from the backup. But there is quite a possibility that the backup doesnt exist or may be incomplete. So what to do next?

Then the only cure is to have SQL recovery through the third party applications which are designed to target the same. However for resisting the future problems, have the latest hotfix released by Microsoft and for the present situation, you can use the SQL repair applications.

These MDF recovery software have the extensive power to scan the database systematically and retrieve the information. The less technically saavy user can end the job of MDF repair, with much ease and effectiveness.

You can blindly trust on Stellar Phoenix SQL Database Recovery for having the safe and valuable SQL recovery. This application uses the most effective scanning algorithms to scan, repair and restore the database. This SQL repair software is found to be compatible with SQL Server 2000 and works for MDF recovery in case of corruption. The safe MDF repair is guaranteed due to its read-only nature.