one of .mdf is non valid

[Migration User]

I have many dozens .mdf files on my HDD working via SQL Server 2014. One of them viewed an error some days ago - The header for file SQL903.mdf is not a valid database file header. I only want to find a solution to repair sql server database.

[CraigEV]

Hi Melissa,

This doesn't appear to be a Client Management Suite issue, and rather a Microsoft issue.

Check below:

https://social.msdn.microsoft.com/Forums/en-US/be7db99a-5e3f-414d-a9e0-d45f99d2928b/corruption-mdf-header-corrupted?forum=sqldatabaseengine

Thanks!

[Migration User]

When you work with sql database during some months and after it becomes invalid. I’m sure every man will waste all the free time for searching reliable solution. I find it in https://www.repairtoolbox.com/sqlserverrepair.html Because even its demo version showed all the features of it

[Deepak Bisht]

You can use the third-party SysCurve SQL Repair tool to fix MDF and NDF files. I find this https://www.syscurve.com/sql-recovery-tool.html. I hope this will work for you.

[James Robert]

Yes, you can repair .mdf file using another SQL Server instance, but it's a complex process. Instead, using a specialized tool like the DRS SQL Database Recovery Tool can simplify the repair.

Steps to Repair master.mdf:

1. Download & Install the DRS Softech SQL Database Recovery Tool.

2. Launch & Add the corrupt master.mdf file.

3. Select Scan Mode (Standard or Advanced) based on corruption severity.

4. Preview recoverable database objects.

5. Save the Recovered Data to a new SQL database or as a script.

This tool ensures quick and hassle-free MDF file recovery.