Easy and Free way to do SQL Database Recovery

  •   Written By
     
  • Published on
    February 6th, 2017
  • Updated on
    March 11, 2021
  • Read Time
    8 minutes

Have you faced the Corruption of your SQL Database?
If yes? Then you have come to the right place. This article will help you to get rid of all the problems related to SQL database Recovery.

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This article is useful not only for the one who wants to fix the corrupted SQL database. But, also for the one whose major work is dependent on SQL Database. So it would be better if you have prior awareness of the SQL Database and methods of MDF File Recovery.

I am going to kick off with an easy technique to restore SQL Database. Though this article is bit lengthy but absolutely worth it.

When disaster strikes you can put the pieces back together only if you were ready.

This article is also useful for the one whose major work is dependent on SQL Database. So it would be better if you have prior awareness of the SQL Database and methods of MDF File Recovery. Moreover, It saves you from getting panicked at that time.
As SQL is very deep and interesting topic, So before beginning the direct technique to fix corrupt SQL database.
I will cover different topics like:

  • Brief of SQL Database
  • SQL Database File Formats
  • Reasons for the Corruption in SQL Database
  • Errors in SQL
  • Manual method of SQL database Repair
  • Professional SQL Database Recovery Tool

Brief of SQL Database

SQL Server is a Microsoft product mainly used to manage and store information. Microsoft SQL Server allows you to store and retrieve a huge amount of data by applying queries to the database. And we all know that Query is nothing but a set of statements which executes specific functions when executed.
Or technically we can say that SQL Server is a Relational Database Management System.

Services Provided by SQL

  • Reporting services
  • Analysis services
  • Replication services
  • Full-text search services
  • Integration services
  • Notification services

Though these services are not essential for the operation of database system but they provide value added services on top of the core database management system.

File Formats Of SQL Database

If you have worked with SQL Server, you must have heard the terms MDF, NDF, and LDF already. Those are the frequently used file name extensions in SQL Server for the Primary Data files, Secondary data files, and Log files respectively.
In SQL Server, data and log information are never stored together in the same file. Moreover, these individual files are used by only one server.

Primary data files( MDF)

A primary data file is the beginning point of the database Every database has one primary data file. Also, all the data in the database objects such as tables, stored procedures, trigger, views, etc. is store in the primary data files only. The most common and recommended file name extension for primary data files is “.mdf”.

Secondary data files(NDF)

You can only have one primary data file for a database and the others file created comes under secondary data files. But it is not necessary to have a secondary data file so some databases do not any secondary data file. It is also possible to have multiple secondary data files for a single database. “.ndf” file extension is usually recommended for secondary data files. It’s also possible for you to store the secondary data file on a separate physical drive.

Log files ( LDF)

Log files in SQL Server databases keep all the log information. That information can be later used to recover and retrieve the database. The size of the log file is determined by the logging level you have set up for your database. There is at least one log file for each database. It is also possible to have more than one log file for one database. The filename extension for log files is “.ldf”.

But unfortunately, these files are prone to corruptions. Corrupt SQL Database is not less any than a nightmare. There is a very high probability that your MDF files may get damaged due to corruption.

Some onscreen errors that pop up in the corrupted Microsoft SQL database.

  • Error Message824 in SQL Server: SQL Server detected a logical consistency-based I/O error
  • Error Message7105 in SQL Server: Error message occur when Large Object (LOB) data referenced by a database page row cannot be accessed
  • Error Message 5180 in SQL Server: Could not open File Control Bank (FCB) for invalid file ID
  • Error Message 605 with SQL Server: Attempt to fetch logical page (1:224) in database 11 failed
  • Error Message 2575 in SQL Server: The Index Allocation Map (IAM) page (1:1816008) is pointed to by the next pointer of IAM page
  • Error Message 2576 in SQL Server: The Index Allocation Map (IAM) page (3:443009) is pointed to by the previous pointer of IAM page
  • Error Message 8909 in SQL Server: Table error: Object ID 0, index ID -1, partition ID 0, all unit ID 0 (type Unknown), page ID (1:1811712) contains an incorrect page ID in its page header. The PageId in the page header = (0:0).The system cannot self-repair this error.
  • Error Message 8998 in SQL Server: Page errors on the GAM, SGAM or PFS pages prevent allocation integrity checks in database ID 11 pages from (1:1811712) to (1:1819799). See other errors for cause.
  • Error Message 8905 in SQL Server: Extent (1:1785120) in database ID 11 is marked allocated in the GAM, but no SGAM or IAM has allocated it.
  • Error Message 825 (read retry) in SQL Server
  • Error Message 832 (constant page has changed) in SQL Server
  • Database consistency errors reported by DBCC CHECKDB
  • Error Message 3414 and a failed database recovery with SQL Server
  • Database System table and user table corruption Errors
  • Database page-level corruption Errors
  • Clustered and non-clustered Index Corruption Errors

Reasons for SQL Database Corruption.

My primary objective to write a blog post on “SQL Database Recovery” was to make you understand the main reasons behind corruption and provides you an easy solution to recover your database from corruption.
Some of the reasons are:

  • Collision with some third-party driver, sometimes MS SQL Server tool may collide with any other software in your system and in the result, SQL Server database files got corrupt.
  • A hardware fault or a crash in your hard disk drive (HDD) system is also one of the reasons of SQL Database File corruption.
  • Deletion of any SQL objects such as views, stored procedures, index, tables, etc. Corruption of database can also occur due to damaged LDF file, SQL database in suspect mode,
  • Corruption in the SQL database can be due to a virus and other software bugs.
  • Or, sometimes human errors also plays a significant role in corruption. Some database users store their files in a compressed volume or folder for more disk space. This also causes corruption in the database files and make the SQL database file inaccessible. So it should be avoided to store SQL Server database files in compressed volumes or folders.

Manual method to Repair corrupt MS SQL

Sometimes executing DBCC CHECKDB and DBCC DBREPAIR commands can repair your corrupted MDF file of SQL Server. The DBCC is nothing but a set of command for checking the logical and physical consistency of a database. DBCC CHECKDB and DBCC DBREPAIR commands are a new query in MS SQL Management Studio.

Below is the step to repair corrupt MS SQL database manually

Step 1: Open Microsoft SQL Server Management Studio on your system.

Step 2: Now click the New Query button.

sql database recoevry

This will open a new query page.
Step 3: Write the SQL Scripts
The commands that you have to execute are stated below:
ALTER DATABASE database_name SET EMERGENCY
DBCC check DB (database_name)
ALTER DATABASE database_name SET SINGLE_USER with ROLLBACK IMMEDIATE
DBCC DATABASE (database_name, REPAIR_ALLOW_DATA_LOSS)
ALTER DATABASE database_name SET MULTI_USER

Make a note: Replace Your SQL Database text by the original name of your database file.

Step 4: Now click on Execute tab.

sql word 3

After this, you can easily check your SQL database. It will be no longer tagged as suspect.

Sometimes the degree of corruption may be severe and this manual solution might not be a successful approach. So if your MDF file is facing a high level of corruption then you have to go for some other method such MS SQL Database Recovery by SysInfoTools. So, the main question which arises is – How to retrieve data from highly corrupted MDF File? Best option to retrieve your vital MDF and other objects of SQL Server is to restore from a good Backup file.
As there are lots of third party recovery software which will help you to get rid of this problem. But which MDF File Repair software to choose for an efficient and reliable solution in the area of major concern. So, choosing a trusted software for SQL Database Recovery s a bit difficult as there are lots of third-party solutions available in the market.

MS SQL Database Recovery of SysInfo is a highly innovative tool which swiftly scans and recovers your data from corrupted and Compressed MDF file in no time and allows you to save your recovered data in a new database file. This tool offers high accuracy recovery of file objects such as tables, programmability, views, triggers, default and etc.

mdf file recovery

SysInfo SQL data Recovery software is the only tool in the market that provides ROW level compression, PAGE-level compression as well as the Unicode compression.
It has many other unmatchable features which make the SQL database Recovery Tool on the top of the line.

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