Database corruption is one of the most frustrating situations one can handle, be it database administrator or database user. And the only challenge for SQL Server users is to repair SQL database. SQL database contains highly precious data and information. But any sort of corruption may put your data at high risk. Just like any other computer 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 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 and many more. If a database file is in 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 anyhow by any chance.
Reasons for Database Corruption
One of the most common reasons behind database corruption is collision with any third-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 the database files to become corrupt. 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?
Though, there are some useful Database Console Commands aka DBCC in MS SQL Server which are applied to check the logical and physical integrity of all the file objects in the particular MDF file. Sometimes DBCC DBREPAIR and DBCC CHECKDB may be useful to repair SQL database if corruption level is not that severe.
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 suspect, which means the file has some corruption issues. Or, you are having problem while connecting to the database. Your database file is at risk as this might be corruption. What will you do to fix it?
There is a manual solution to fix this problem, but you need to 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 this, you can check your database. It will be no longer tagged as suspect.
Professional Solution to Repair SQL Database
In case of severe corruption, the above manual approach may fail to repair SQL database. 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 know which one is the best among all? It’s simply impossible to find out the best tool without prior evaluation. Thankfully, most of the software companies provide third-party tools with free demo or trial version. You can download demo versions to check the preview of your recovered data. If it satisfies you, you can purchase the licensed version. Or if it doesn’t, you can go for another one.
SQL Database Recovery tool from SysInfoTools Software helps you repair SQL database and recovers maximum possible data from them. It can save the output, which are recovered from corrupted MDF files, into a new file of either SQL database format or SQL script. It supports MDF files of MS SQL Server 2000, 2005 and 2008. To know more about this software, please visit SysInfoTools’ website and download the free demo version of this software.