Most of the users of MS SQL server need to deal with a wide variety of issues when they are working with the SQL Server database. A great number of these issues are connected with the corruption of database files. Since data is the backbone of the operations of a company, its corruption might lead to severe losses and inaccessibility of useful and essential information. The forthcoming section will address one specific corruption problem related to index in the database and the techniques to repair clustered index in SQL Server without any hassles.
Reasons for SQL Database Clustered Index Corruption
Clustered Index in SQL Server is defined as an index that changes the arrangement of the style in which the records are saved physically in the database table. Each table possesses a single clustered index, the leaf node of which hold the data pages.
Since there is only one order in which records are saved in SQL Server DB, it is recommended to have several non clustered indexes as a safety backup.
When a clustered index of a database gets corrupted, you will be shown an error message which may be similar the message given as follows
Manual Ways to Repair Clustered Index In SQL Server
MS SQL Server has an inbuilt command called DBCC CHECKDB which proves to be useful in such cases. It assists to check and verify and also get details about the logical and physical integrity of the database. The syntax for this command is given as follows
DBCC CHECKDB (CorruptDB) With No_InfoMsgs, All_ErrorMsgs, TableResults; GO
If you successfully execute this command, you will get information about the database such as Database ID, Object ID and Index ID. Index ID mapping can be understood as ID=2= Non Clustered, ID=1= Clustered, ID=0=Heap.
If your SQL Server database Index ID value is shown to be 0 or 1. then follow the methods given in the section below to repair clustered index in SQL server
Method 1: Restore From the Backup
Backups can assist to restore a specific version of SQL Server database which loaded normally the time it was most recently used. If in case the data model is full or bulk-logged, it would be a better option to create a tail-log backup so as to capture records that were not backed up.
Method 2: Repair Individual Pages
For repairing Individual page, you can make use of the given command
RESTORE DATABASE DB_Name PAGE=’1:80967’ FROM DISK=’C: /DB_Name.bak’ WITH NORECOVERY
1:80967 tells that the index ID value is 1 and the page number under consideration is 80967
Method 3: REPAIR_REBUILD Command
The REPAIR_REBUILD command can be used for treating lower levels of corruption which is present in the SQL database. REPAIR_REBUILD provides facility to repair clustered index in SQL Server by rebuilding the database contents. Make use of following SQL command for achieving this target
DBCC CHECKDB (‘Database_Name’, REPAIR_REBUILD)
Method 4: Collective Page Repair
You can Use this method if there is a requirement to repair and completely remove all the errors from the SQL Server database. Although this method poses a threat to data security when the process has been concluded.
DBCC CHECKDB (‘DB_Name’, REPAIR_ALLOW_DATA_LOSS)
In case the corruption levels are extremely high, the REPAIR_ALLOW_DATA_LOSS command will deallocate all the erroneous database pages from the memory and will modify all the associated links
Problems With Manual Methods
Despite the notion that the techniques discussed in the section above can be pretty useful, there’s a high probability that it would further increase the number of issues. A number of shortcomings are associated with these techniques to repair clustered index in SQL server, which are listed below
- Great amount of useful time is taken for executing the commands
- A constant threat of crucial and sensitive data getting lost permanently
- Users with less technical adeptness may find the approaches as highly complex to repair clustered index in SQL server database
- No assurance of 100% success after executing these commands
Professional Way to Fix Index Corruption in SQL Server
Due to the limitations of the manual process, it is confirmed that this is a completely unreliable solution to tackle such types of issues. So, the best way to fix index corruption in SQL server is by using a proficient SQL Repair tool. It can repair MDF file of SQL Server 2019, 2017, 2016, 2014, 2012, etc., and also offers the facility to preview all recovered database items before saving. With this tool, one can easily repair the corrupt tables, index, views, stored procedures, etc. also export them to a new database or into an existing database without any kind of data loss issue.
Additionally, the software has such a user-friendly simple interface that inexperienced users who may not have relevant experience can also operate it easily without any prior technical knowledge.
SQL Server database inbuilt commands in SQL that help to remove the problem of a clustered index. Still, a number of problems are faced by users while using these commands. Thus, a suitable alternative is to use a specialized software application to repair clustered index in SQL server without causing any further stress.