Corruption in SQL Server Database is one of the biggest problem DBA/ users faces while working on SQL Server Database. The corruption may occur accidentally or unknowingly. One should always be ready to face corruption and must have proper planning to recover from SQL database corruption. To resolve the issue, you need to understand the reason Why database corruption occur? So that you can find out the solution accordingly.
But first let us have a look what this blog will cover:
Let us start with the causes of Database Corruption ?
There are number of reasons Why SQL database corruption occurs. It’s not always the fault of SQL Server to cause corruption. It is estimated that 99% of corruption in SQL Server is caused by I/O Subsytem. It means the root cause of corruption is the problem with drivers, controllers, CPU etc.
Below are the list of reasons What are the causes of SQL database Corruption:
When your database is corrupted, then you face number of errors which are as below:
It does not alarm you by notifying that there is corruption in your SQL Server Database. You need to check it by running query, if corruption persists in the database or not.Fetch your database by running below query:
Select * FROM database_name;
If your database is corrupted, the above command will fetch the corruption error to the database.
One more option to check the consistency of the database is by running DBCC CHECKDB.
DBCC CheckDB() WITH NO_INFOMSGS;
It will check the physical as well as the logical consistencies of the database objects and if any corruption persists, it will show you. The command runs along with DBCC CHECKTABLE, DBCC CHECKALLOC, DBCC CHECKCATALOG.
Here are some list of steps one should take on regular basis, if you dont want SQL database Corruption.
What will you do if you follow all preventive measures for SQL Database corruption and still getting corruption?? Or maybe you are still facing symptom that indicate SQL corruption?
Dont Worry!
Here I will be discussing foolproof methods on how to recover sql server database. Have a look. I will also give you some Tips which you should not do if your SQL MDF file is corrupted.
You can fix SQL Database corruption by running DBCC CHECKDB.
DBCC CHECKDB(name_of_corrupted_database) WITH NO_INFOMSGS;
Check your Index_ID, if ID is either 0 or 1, then run DBCC CHECKDB along with its REPAIR commands.
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 ] } ] ]
The manual method have some limitations. If your SQL MDF file is severely corrupted, then there might be possibility that the manual method fails. Or it could lead to the data loss. Then one should make smart move by using third-party Utility i.e. SQL Repair Tool to fix SQL Server database. Software repairs corrupted SQL database files and recover all database objects like tables, function, stored procedure etc.
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Sometimes user worsen the situation, by doing inappropriate task which should not be done when SQL Database corruption is found. I will be discussing some tasks which is a Big No, when database corruption is detected.
Important Note: You may also read this post to know how to Fix SQL Database Consistency Errors
Corruption in SQL Server Database is one of the scariest thing any DBA and SQL professional could face. Here, we are discussing about the same. The blog covers the causes of SQL Server Database corruption and how you can identify it. Solution to repair corrupted database in healthy state has also discussed. It also covers preventive measures one should take when SQL Server Database is in corrupted state.