SQL Server users may face any of the following error messages while having an update or delete operation on an indexed table:

Error: 644, Severity: 21, State: 5
Could not find the index entry for RID ‘1613b1000000100′ in index page (1:189), index ID 7, database ‘TestDB’..

Or

Error: 8646, Severity: 21, State: 1
The index entry for row ID was not found in index ID 7, of table 2009058193, in database ‘test644′..

These particularly occur when the user performs a delete or update operation on the table which possesses a Unicode column with a Latin1_General_BIN collation.

Microsoft has resolved this issue with the release of latest service pack of SQL Server. But, this has been reported that after the application of hotfix, a database problem like index corruption is seen with the database in the form of 2511 like error messages. However, if you apply DBCC CHECKDB before the service pack, no related issues are encountered. So to correct the database, rebuild them.

Error 644 can be the outcome of some other problems too, so to be confirmed of that your problem is with regard to the one that we are discussing here, use a trick. Use DBCC CHECKDB not directly on the production server, but instead back it up on test server and then apply the SQL repair utility.  After this, you can apply it on the original one and if you get the positive results, repair the corrupt indexes.

In case, you fail to rebuild indexes (as per the details provided in error message) and your database remains affected from corruption, SQL recovery software can cure it for sure. These are the applications, viable for all MDF objects, which perform MDF repair with the best scanning algorithms. Packed with the valuable options of MDF recovery, the software have a safe conduct to the data and interactive interface to offer.

Stellar Phoenix SQL Database Recovery has been judged out as the most worthy tool to scan database and impart SQL repair with the extensive scanning algorithms. This SQL recovery application is compatible with SQL Server 2000 and 2005.

Giving MDF repair for all the database objects, the software offers easy and effective MDF recovery with the interactive interface.