How to Repair MDF File?

Database corruption and inaccessibility of MDF files are serious issues faced by SQL administrators. They can affect the business operations and can even lead to revenue loss and reputation damage. So here we discuss the reasons behind SQL database corruption and common ways to repair MDF files.

Reasons for SQL corruption

MDF files of SQL database are prone to corruption. And there can be many reasons for the corruption of MDF files. They include hardware faults and issues with disks, subsystems, drivers, controllers, CPU or memory module. Software bugs, usage of older versions of Windows OS or SQL, keeping data or backups in compressed folders, non-exclusion of MDF files from anti-virus scanning, etc. also can cause SQL issues.

Repairing damaged MDF files

It is quiet easy to repair the damaged files. You can either chose to restore the MDF files from the last backup that your system had carried out or chose to execute the inbuilt DBCC CHECKDB command. Though it is easy to restore data from backup, backups may not be up-to-date always. So, it is always recommended to fix the corruption issues using DBCC CHECKDB command. And if the repair process is not a complete success, one can rely on professional MDF recovery tools too. We will discuss both the methods here.

Repairing using the DBCC CHECKDB Command

DBCC commands or Database Console Commands (in Transact-SQL) help to check the physical and logical consistency of a Microsoft SQL Server database, and also to fix existing issues. The DBCC CHECKDB command performs functions of three commands, namely DBCC CHECKALLOC, DBCC CHECKCATALOG and DBCC CHECKTABLE, thus avoiding the need to run these commands one by one.

The DBCC CHECKALLOC command is used to check disk space allocation structures for a database, and the DBCC CHECKTABLE to check the integrity of the pages and the structures that build indexed view or tables; the third of these DBCC CHECKCATALOG is used to check the consistency of an online database. The DBCC CHECKDB thus helps in fixing all SQL database consistency issues. For this, run the command in following syntax:

DBCC CHECKDB

[ ( database_name | database_id | 0

[ , NOINDEX

| , { REPAIR_ALLOW_DATA_LOSS | REPAIR_FAST | REPAIR_REBUILD } ]

) ]

[ WITH

{

[ ALL_ERRORMSGS ]

[ , EXTENDED_LOGICAL_CHECKS ]

[ , NO_INFOMSGS ]

[ , TABLOCK ]

[ , ESTIMATEONLY ]

[ , { PHYSICAL_ONLY | DATA_PURITY } ]

[ , MAXDOP = number_of_processors ]

}

]

]

Professional solutions for SQL recovery

At times, the repair and recovery using the manual methods may not yield satisfactory results. Also, many SQL administrators consider the process to be complex and lengthy. So they prefer SQL recovery solutions over the Transact-SQL commands. Kernel for SQL Database Recovery is a professional tool to restore the corrupt database files of SQL server. It recovers MDF file data (from any SQL server version) and saves it to a live server or in a batch file. Most importantly, all these actions can be performed from the friendly interface of Repair MDF software.



  

 

Related Software


Kernel for SQL Database
Kernel forSharePoint Server

 
 
Support Center 1-866-348-7872 0-808-189-1438
Stay in touch
Subscribe Newsletter

Subscribe to get $5 off Coupon and be informed about our latest offers & news...