Database corruption is one of the most frustrating situations for any individual, be it database administrator or database user. And the only challenge for SQL Server users is to repair SQL database. SQL Server database contains highly precious data and information. But any sort of corruption may put your data at high risk. Just like any other file, SQL database file is also prone to corruption. And due to this, you may lose your data.In this blog post, we’ll learn how to handle corruption in SQL Server database by using MS SQL Server Management Studio. Also, we’ll talk about professional software utility to repair SQL database. Before we can look forward to any of these solutions, let’s first talk about SQL database and why corruption takes place.
In Microsoft SQL Server, the database files are saved with MDF file extension. An MDF file stores a large amount of data and information in the form of tables and other file objects, such as views, stored procedures, triggers, indexes, keys, constraints, rules, etc. If a database is in an invalid state, you would have no problem regarding its accessibility. But if your file is invalid due to corruption, it becomes inaccessible, i.e. you can’t open it by any chance until unless you repair SQL database.
Reasons for Database Corruption
One of the most common reasons behind database corruption is a collision with any 3rd party driver. MS SQL Server tool may collide with any other installed software and may harm the SQL Server database files. Other than this, virus attack or bug infection can also corrupt the files. A hardware fault in your system or a crash in your hard disk drive (HDD) may cause corruption in database files. Or, sometimes human errors may also play an important role in corruption. A few of database users store their files in a compressed volume or folder for having more disk space. This may cause corruption in the database files and make them inaccessible or unsuitable. So it should be avoided to store SQL Server database files in compressed volumes or folders.
How to Repair SQL Database?
To repair SQL database, you can use a couple of Database Console Commands aka DBCC in Microsoft SQL Server. Via DBCCs, you can check the logical and physical integrity of all the file objects in a particular MDF file. The database console commands which you can use here are DBCC DBREPAIR and DBCC CHECKDB. If corruption level is not that severe, you must run these commands on SQL Server Management Studio to repair SQL database.
Consider the scenario given below:
You have been working in an SQL Server database from last few days. One day you find that the database file is tagged as suspected. This means the file has some corruption issues. Or, you’re having a problem while connecting to the database. Your database file is at high risk as this might be corruption. What will you do to fix it?
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There’s a manual solution to fix this problem, but you must have Microsoft SQL Server Management Studio for that. If you have it, you need to follow the steps given below:
This will open a new query page.
Step 3: Write the SQL Scripts (shown below) on the page:
EXEC sp_resetstatus [YourDatabase];
ALTER DATABASE [YourDatabase] SET EMERGENCY
DBCC checkdb ([YourDatabase])
ALTER DATABASE [YourDatabase] SET SINGLE_USER WITH ROLLBACK IMMEDIATE
DBCC DATABASE ([YourDatabase], REPAIR_ALLOW_DATA_LOSS)
ALTER DATABASE [YourDatabase] SET MULTI_USER
Note: Replace YourDatabase text by the original name of your database file.
After that, you can check your database. It’ll be no longer tagged as suspected.
Professional Solution to Repair SQL Database
Sometimes, the manual approach may fail to repair SQL database, especially when the corruption level is severe. In such situation, you should look for some professional third-party software programmed to smartly handle any level of corruption, so that data recovery from corrupt SQL database becomes easy for you. Searching such recovery tools online is very easy and effortless, but choosing the best one would be challenging sometimes. If you search SQL database recovery term on Google or any other search engine, you’ll find a wide range of options there.
How would you choose the best one? It’s simply impossible to find out the best tool without prior evaluation. Thankfully, most of the software vendors provide 3rd party tools with the free demo/trial version. You can download the demo version to check what you could recover from the corrupt MDF file before you can actually pay for the software. If you’re satisfied with the results, you can purchase the licensed version. But if you’re not satisfied, you can try another tool.
SQL Database Recovery tool from SysInfoTools Software can repair SQL database and perform SQL data recovery from corrupt MDF file. It supports corrupt MDF file created by MS SQL Server 2000, 2005, 2008, 2012 and 2016. It can successfully fix corrupt MDF file and restore SQL database objects from it, such as tables, triggers, indexes, keys, constraints, rules, defaults, etc. This SQL Data Recovery tool can save all the recovered data into an SQL Server Database and/or in the form of SQL Scripts. To know more about this software, please visit SysInfoTools’ website and download the free demo version of this software.