SQL Server database file (MDF file) corruption or damage can occur due to SQL Server malfunctioning, improper server shutdown, virus infection, hardware failure and more. Once the SQL database gets corrupted, the SQL database can become completely inaccessible. In such situations, if there is no backup available, the user needs to perform SQL database repair by using advanced SQL Repair application.

Consider a practical scenario, where a user is working on SQL Server 2005 and creating a report. While doing so, the Windows server restarts due to power failure and the user encounters an abrupt server restart screen prompting for the reason and information. Due to the operating system issue, the SQL database becomes inaccessible. When the user tries to attach the MDF manually, he encounters the below error message:

“An exception occurred while executing a Transact-SQL statement or batch. <database name>_db.mdf is not a primary database file. (Microsoft SQL Server, Error: 5171).”

“C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data\MYDATABASE.mdf is not a primary database file. (Microsoft SQL Server, Error: 5171)”

In such circumstances, the database administrators recommend to attach a single file. However, when the user uses sp_attach_single_db Stored Procedures, the user encounters the following error message:
“Server: Msg 5172, Level 16, State 15, Line 1
The header for file path”"\.mdf is not a valid database file header. The PageAudit property is incorrect.”


The main cause of the above error message is MDF file corruption. The above issue occurs when the MDF file header gets corrupted or due to insertion of some invalid information in the header file. All these situations result in inaccessibility of the SQL database. To ensure complete accessibility of the SQL database, the user needs to recover it from the latest backup. But if the user has not created any backup of the inaccessible MDF file, then he needs to perform MDF repair. To do so, the user needs to use effective SQL Repair application. Such applications incorporate advanced and powerful scanning methods to repair the corrupted MDF file. The recovery software perform systematic scan of corrupted MDF files, repair and restore them in their original format without altering any information.

Stellar Phoenix SQL Database Recovery is the most trustworthy SQL recovery software. This repair software can Repair SQL objects such as, tables, reports, forms, macros, database constraints, stored procedures, triggers etc. It supports SQL Server 2005 and 2000. It is compatible with Windows Vista, XP, 2003 and 2000.