Microsoft SQL Server repair tool

How to repair a damaged Microsoft SQL Server MDF file?

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Recovery Toolbox for SQL Server

Recovery Toolbox for SQL Server helps to fix the corrupted MDF files of an MS SQL Server for all versions

How to repair a Microsoft SQL Server database

How to repair a corrupted or suspended Microsoft SQL Server database. How to repair data from a damaged *.mdf file - step-by-step instructions:

  1. Download the Recovery Toolbox for SQL Server here:
  2. Install the Recovery Toolbox for SQL Server
  3. Start the Recovery Toolbox for SQL Server
  4. Select the corrupted *.mdf file
  5. Preview the data that can be retrieved from the corrupted Microsoft SQL Server database
  6. Choose the method of the data export
    • Save as SQL scripts to disk
    • Execute the SQL script directly on the database
  7. Choose the information that should be repaired and saved
  8. Press Start Recovery
sql repair

Recovery Toolbox for SQL Server helps to repair corrupted MDF files of Microsoft SQL Server databases. The SQL MDF repair program can fix many errors, including:

  • The FILE SIZE property is incorrect. (Microsoft SQL Server, Error:5172)
  • SQL Server Detected A Logical Consistency-Based I/O Error: Incorrect Checksum. (Microsoft SQL Server, Error:824)
  • The Index Allocation Map (IAM) Page is Pointed to by the Next Pointer of an IAM Page.
  • I/O error (bad page ID) detected when reading at offset 0x###### in file FileName.mdf.
  • File Appears To Have Been Truncated By The Operating System.
  • During the Redoing Of A Logged Operation In Database 'DatabaseName', An Error Occurred At Log Record ID.

Features of MS SQL Server database repair tool:

  • Repair SQL Server database and *.MDF files of all versions of Microsoft SQL Servers: 7/2000/2005/2008/2008 R2/2012/2014/2016/2019
  • Repair all objects of corrupted .mdf files: data types, table cell data, views, stored procedures, custom functions, triggers, indexes, primary and foreign keys, restrictions and other
  • Repair SQL database stored in several files (*.mdf + *.ndf files)
  • Export repaired data into Microsoft SQL Server databases directly
  • Save fixed data as SQL scripts
  • Preview of recovered data and structures
  • The SQL Repair tool successfully tested under Windows 98/Me/2000/XP/Vista/7/8/10/11 or Windows Server 2003/2008/2012/2016 and above
  • Multi-language interface included in the MDF repair tool
  • Recovers Your Data after a Ransomware Encryption Attack
  • MDF Viewer

Recovery Toolbox for SQL Server is an all-in-one MS SQL database repair solution for corrupted MDF/NDF files. Recovery Toolbox for SQL Server helps to repair mdf files and recover data from suspended databases

SQL Database Repair

The process of repairing a SQL Server database is a complex task consisting of several steps. The process of fixing SQL Server corruption involves restoring the MDF file in which all database objects are stored:

  • Tables
  • Stored Procedures
  • Functions
  • Triggers
  • Indexes
  • Viewers

Recovery Toolbox for SQL Server works on the basis of a very complex algorithm of SQL database repair from Microsoft. In order to repair database SQL Server, the first step is to define and identify the pages of the data blocks within the file. A page is just a universal block of data storage in an MDF/NDF file. The block size can be set by the database administrator. By default, the page size is about 8K bytes. Each page of the repaired MDF file has a unique index and number. Based on this unique information, you can filter out irrelevant and unused page numbers when trying to repair SQL database. Extra pages usually appear when modifying or deleting user data in an MDF file. Recovery Toolbox for SQL Server excludes redundant pages when going to repair SQL databases, so that the data is not duplicated and only actual data is transferred to the recovered data. After completing SQL Repair Database, deleted or modified records or tables should be excluded from the recovered MS SQL databases so that their integrity is not compromised.

repair sql db

How to repair MDF file

MDF repair cannot be done simply by fixing or modifying the contents of a damaged MDF file. An MDF file has a complex structure with multiple connections between objects. Accordingly, the slightest edits inside the corrupted MDF file will lead to a violation of the integrity of the data and further complicate the recovery of the MDF file. This, in turn, may lead to increase of time required to repair database MSSQL, or overall loss of the possibility to repair SQL DB. Therefore, to answer how to repair MDF file, it is necessary to completely understand the process.

The process of MDF file repair is carried out in several stages:

  1. Analyze of the structure of an MDF file
  2. Select pages that store data
  3. Structure data pages in an MDF file
  4. Delete of redundant pages to avoid duplicate content
  5. Highlight system data that describes the structure of the stored data
  6. Assemble disparate data into shared structures of tables, indexes, and other objects
  7. Save data as separate files as SQL script (*.sql files)
  8. Create a New Database in MSSQL Server
  9. Sequential import data from SQL scripts (*.sql files) to a new database
  10. Replace a corrupted database with a new MDF file (new database)
repair sql databases

As a result of repair SQL Server database, after importing all the data extracted from the corrupted MDF file into a new database, this new database is considered to be a repaired SQL DB; and the MDF file of the new database, created during repair MS SQL, is the recovered MDF file. In other words, this algorithm allows Recovery Toolbox for SQL Server repair database MS SQL by creating a working version of it, which is the exact copy of the original file before it got damaged. To repair an MDF file, you first need to restore the data (tables), then all other user objects (Stored Procedures, Functions, Triggers, Indexes and Viewers) are restored. In other words, the recovery of an MDF file goes through an intermediate step: saving the data to .sql files. As a result, the corrupted MDF files of the damaged MSSQL Server database are not edited or modified in the process of repairing SQL databases.

repair database sql server


  • Windows 98/Me/2000/XP/Vista/7/8/10/11 or Windows Server 2003/2008/2012/2016 and above
  • Microsoft SQL Server: 7/2000/2005/2008/2008 R2/2012/2014/2016/2019