However, there are a lot of ways you can fix this problem with manual solutions or by using a smart, dedicated tool third-party tool called Recovery Toolbox for SQL Server. But before starting the troubleshooting, let’s understand and investigate a little bit why is this problem happening in the first place.

What is an SQL Server and how can we identify the database?

An SQL Server is a database system, developed by Microsoft, that is used for managing, storing, and retrieving data by other applications. There are three types of files to store and manage data in an SQL Server: primary files (with a .MDF extension), secondary files (with the .NDF extension), and log files (with the .LDF extension). We are particularly interested in those MDF files because those are the ones that provide the database storage.

Why does a database become corrupted on an SQL Server?

There are a lot of possible reasons why your SQL server database can become corrupted, from a simple overwrite or accidental file deletion to virus infections and incorrect configuration. Let’s go through some of the most common causes for this issue:

Overwriting a file – If you write over an existing MDF file by mistake you risk corrupting the database Trying to unlock the SQL database – If you forgot the SQL password and enter it wrong too many times, this can lead to SQL Server Corruption Failure on your storage drive – It goes without saying that a drive malfunction can produce file corruption, including the database Problems with SQL database configuration – If the SQL configuration changes, that can disable the access on MDF files Virus infection – This is a common problem for any file corruption, not only the SQL database files and even if you remove the virus by using the best antiviruses, unfortunately, you might still lose some data SQL internal bugs – Although it’s a strong solution, it may still have its bugs that can cause MDF files corruption

That being said, follow our step-by-step guide to learn how to repair an SQL database file on an SQL Server.

How can I repair a corrupted database in SQL Server?

1. Restart the SQL Server

Sometimes, you can solve the problem just by restarting the SQL Server. Of course, it doesn’t work every time but it’s so easy to perform that it wouldn’t hurt to perform.

2. Repair a damaged table

The REPAIR TABLE will help you repair a table and you can do the same for any other corrupted ones but this way, you might lose some data from the table.

3. Use the mysqlcheck command

4. Use the ALTER TABLE commands

5. Repair the database using Recovery Toolbox for SQL Server

So, this is how to repair SQL server database files with this simple and effective tool. As you can see, it will get the job done a lot faster. The MS SQL server recovery tool will also help you if you’re facing the following problems with the MDF database:

Microsoft SQL Server error 5172 – The FILE SIZE property is incorrect SQL Server Detected A Logical Consistency-Based I/O error – It’s an incorrect Checksum, otherwise known as error 824 in the SQL Server The Index Allocation Map (IAM) page is pointed to by the Next Pointer of an IAM Page – It’s a pretty common problem I/O error, bad page ID, detected when reading at offset 0x###### in file FileName.mdf – This doesn’t appear to often but you can still repair it with this small tool File appears to have been truncated by the Operating System error – Most likely caused by a configuration problem An Error Occurred At Log Record ID – It occurs during the redoing of a logged operation in the database

Actually, with Recovery Toolbox for SQL Server repair all objects of corrupted .mdf files including data types, table cell data, views, stored procedures, custom functions, triggers, indexes, primary and foreign keys, restrictions, and others. And the great advantage is that you can export the repaired data directly into the Microsoft SQL Server seamlessly from the app. This is it! Now you know how to repair your SQL Server database manually or by using a dedicated tool. If you know additional methods or have any questions, we wait for them in the comments section below.

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