How to recover corrupted database file( .mdf .ldf).

EXEC sp_configure 'allow updates',1

RECONFIGURE WITH OVERRIDE

UPDATE sysdatabases SET status=1073741840 WHRE name='DatabaseName'

CHECKPOINT--shutdown with nowait

DBCC traceon(3604)

DBCC rebuild_log ('DatabaseName', 'C:\Program Files\Microsoft SQL Server\MSSQL\Data\DatabaseName_Log.LDF')


USE DatabaseName
sp_dboption 'DatabaseName', 'single_user', 'true'

ALTER DATABASE DatabaseName SET SINGLE_USER WITH ROLLBACK IMMEDIATE

DBCC CHECKDB (DatabaseName, REPAIR_ALLOW_DATA_LOSS) WITH NO_INFOMSGS

USE MASTER

UPDATE sysdatabases SET status = 0 WHERE name = 'DatabaseName'

DBCC CHECKALLOC ('DatabaseName')

DBCC CHECKDB ('DatabaseName')

sp_dboption 'DatabaseName', 'single_user', 'false'

USE MASTER

sp_configure 'allow updates', 0

EXEC sp_resetstatus DatabaseName