How to Handle Clustered Index Corruption in SQL Database?

Summary: This blog is all about SQL Server clustered index corruption issue and the ways to fix this error.

Microsoft SQL Server is usually set up and used by several medium and large sized businesses to store and access their large amount of data in a safe and secure way. Although highly reliable yet both its primary MDF file and secondary NDF file are not immune to turning corrupt.

The type and level of corruption caused in the SQL Server are different. One such issue is corruption in its clustered index that makes the data stored in MDF and NDF file inaccessible. This, of course, would be the worst situation for any DBA working on the particular SQL Server in which the error occurred. Identify the cause of corruption in SQL Server’s clustered index in the section below —

 Cause of SQL Server’s Clustered Index Corruption

This section will state the reasons behind corruption issue in the clustered index of SQL Server. If there is corruption in the clustered index of the database, you will get the following error message:

Server: Msg 1902, Level 16, State 3, Line 1
Cannot create more than one clustered index on table ‘Table Name’. Drop the existing clustered index ‘Clustered Index Name’ before creating another.

It is essential for you to know what clustered index of SQL Server is before we delve into the cause of corruption. A table can have only one clustered index because the clustered index dictates the physical storage order of the data in the table. Now, the SQL Server error 1902 indicates that there is more than one clustered index on the table.

Solution to the SQL Server Clustered Index Corruption

As a table in SQL Server database can have only one clustered index, therefore, it is essential for you to create any additional indexes on the table as non-clustered. Also, if you wish to alter the way in which the SQL database table is clustered, then it becomes necessary to first drop the existing clustered index before creating a new one.

There are two methods to handle corruption in the clustered index of SQL Server. You can either do it by

  1. Restoring the backup
  2. SQL database repair software.

The DBCC CHECKDB command checks the logical and physical integrity of the database so, I will suggest running this command first because it will return you the Database ID, Object ID, and Index ID.

DBCC CHECKDB (CorruptDBName) With No_InfoMsgs, All_ErrorMsgs,

After checking the index ID, you can easily choose the appropriate action to fix this error.

  1. Restore Backup – If a backup of the server database is present, it can always be restored to get the working copy of the server’s database. However, this method of page level restoration is useful only when the alterations in the database is less, and only the single page of the index has been damaged. If there is corruption in multiple pages of the clustered database, you would have to perform the database level restoration. You can also use the inbuilt DBCC CHECKDB command to check both the logical and physical integrity of the database’s objects. With this, you could easily find the exact reason of corruption.
  1. Use SQL Database Repair Software – The other way to handle SQL database clustered index corruption is using a SQL database repair software that is capable of repairing corrupt or damaged Microsoft SQL Server database (MDF) files safely, securely, and successfully. The use of software makes the process fast and eliminates manual intervention. Also, it is the best alternative when you do not have a backup.

download sql database repair software

The Way ForwardStellar Repair for MS SQL

The SQL Recovery software easily fixes the clustered index issue. It is an easy-to-use application and provides a number of benefits along with repairing the damaged SQL Server MDF files. Plus, as it is devised with powerful algorithms it never fails. Its additional capabilities are as follows:

  • Repairs damaged MDF and NDF files
  • Retrieves tables, indexes, triggers, rules, keys, and defaults
  • Perform recovery of deleted records
  • Searches and recovers specific database objects
  • Saves repaired files in MDF (New MS SQL database Or Live MS SQL database), XLS, CSV, and HTML file formats
  • Supports MS SQL Server 2019, 2017, 2016 and lower versions

With all the above benefits, handling a corrupt clustered index using Stellar Repair for MS SQL software is the best bet!

  1. Mia Noah September 12, 2018
    • Eric Simson September 13, 2018
  2. Donald Gray January 2, 2018
  3. Lin July 5, 2017
    • Jyoti Prakash July 5, 2017
  4. Robert Lee June 7, 2017
    • Jyoti Prakash June 8, 2017

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