Secure SQL Database From Clustered Index Corruption

MS SQL Server is a Relational Database Management System usually setup in business and enterprise level organizations. Though known to be highly secured, its MDF and NDF files are not immune to corruption. When the primary and secondary SQL database gets damaged the data stored in it gets inaccessible and also error message prompts up when the SQL files are tried to open. One such damage that severely affects the primary file (MDF) together with secondary (NDF) files is clustered index corruption in MS SQL Server database that makes the data unobtainable.

Such cases lead to nightmare for any of the SQL Server professionals. These data are no doubt critical, sensitive and specifically belong to the respective organization whose loss can be accepted on any grounds. Hence, an effective solution should be applied to get rid of clustered index corruption and other damage issues. But before availing the solution it is necessary to know about corruption in SQL Server.

How Clustered Index Corruption Happens?

One of the common error messages that prompt up due to clustered index corruption in MS SQL Server database is mentioned and explained in the section below:

SQL Server Error Message – Msg. 1902

Error Message
Server:Msg. 1902‚Level 16&sbquo State3‚ Line1
Cannot create more than one clustered index on %S_MSG '%.*ls'. Drop the existing clustered index '%.*ls' before creating another.

Cause: SQL Server error 1902 indicates that there can exist, only one clustered index on a SQL database table. A clustered index determines the physical order of data in a table and is correspondent to a directory system which arranges data by last name. A table can store only one clustered index because of the fact that the clustered index dictates the physical storage order of the data in the table.

Solution: Since a table can only have one clustered index, it is necessary to create any additional indexes on the table as non-clustered. Also if it is desired to change the way SQL database table is clustered; then it gets necessary to drop the existing clustered index first before creating a new one.

Handle & Retrieve SQL Database

However, several SQL error messages can occur similar to SQL server error 1902. At instances when clustered index corruption in MS SQL Server database is caused or any other related issues affects the files then an apt solution should be applied. Some of them are discussed below:

  • Many recommend restoring backups to retrieve data. But problem may arise when backup may not be available though there are minimum chances. The other trouble is that for cases where corrupt database element is encountered very late, restoring from backup does not work. This is because by the time backup may have got corrupted as well.
  • The in-built utility DBCC CHECKDB can be used to check the logical and physical integrity of all the objects in the specified database.

Note - DBCC CHECKDB is supported on databases that contain memory-optimized tables but validation occurs only on disk-based tables.

  • At last, if you need to solve this without any data loss and want to recover SQL database firmly as well as to remove clustered index corruption in MS SQL Server database, then you can optimized external tool to retrieve all data from corrupt SQL MDF and NDF files. One such tested tool is SQL recovery that easily recovers triggers, rules, functions, tables, stored procedures, XML data types etc.
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