Rebuild SQL Database with Corrupted or Deleted Log File

Summary: If you have lost the log file, all you have to do is rebuild the SQL database. Follow the technical document to rebuild SQL Server Database with corrupted or deleted log files. Here, we will discuss two manual and professional (SQL Recovery) methods to repair and recreate the SQL Server database.

In any business, there is a lot of data in computers, which is very sensitive for businesses. Hence, any business needs to have a reliable, robust, and secure database system. The SQL Server is continuously proving itself as an advanced relational database management system. However, any failure of the system, data loss, or corruption of data can be a major problem for businesses. So, businesses need to know how to rebuild SQL database with corrupted or deleted log files.

SQL Server database has three main types or formats followed by MDF, NDF, and LDF. MDF and NDF are primarily used to save or store the database objects such as Triggers, Tables, Functions, Stored Procedures, Indexes, Views, and so on. Whereas, the log file or the LDF keeps all the transactions, activities, and changes performed on the database.

However, the corruption in any log file or LDF file will lead to an inaccessible SQL Database Server and requires repairing. Well, it is quite a monotonous task to repair or rebuild SQL Database with corrupted or deleted log files. Thus, we are here to assist users with every issue of the SQL Server Database. In this technical write-up, you will find the methods to repair SQL Server Database with corrupt or deleted log files.

Before proceeding with the methods to overcome the database’s unable to access SQL Server, we must know the possible causes of it.

User’s Query: I am using the SQL Database Server to organize all the data items of my business. But, a few days ago there was an unexpected shutdown of the power supply in my Office. And After that, I tried a lot to access the SQL Database but failed every time. Please Help- How do I restore a SQL database from a transaction log?

When do the Transaction Log files/LDF Corrupt in SQL Server Database?

Various reasons are there for corrupt transaction log files. Some of them are mentioned in the below section. Analyze them to keep the log files away from corruption.

• The above user query has already explained a reason for the corruption of log files. When a sudden or unexpected loss of power supply or a forced shutdown of your systems.
• Sometimes, a virus attack or a malware infection can lead to corruption in transaction log files.
• Increment in the number of transaction log files is also responsible.
• When a user accidentally deletes the data items.
• Changes or modifications in SQL Server accounts can corrupt SQL transaction log files.

Methods to Rebuild SQL Database with Corrupted or Deleted Log File

It has been seen that with the hardware issues we can face the situation of being unable to access SQL Server databases. You must fix the hardware issue and check if the SQL Server issue persists or not. Here, In this blog, we will discuss three different methods to repair corrupted or damaged Log files.

• Rebuild Corrupted Transaction Log File
• Use of Backup File to Rebuild SQL Server Database
• Professional and Experts Suggested methods to Rebuild SQL Database

1. Rebuild SQL Database with Corrupted or Deleted Log File

First of all, we will repair the corrupted log file and then rebuild the SQL Server database. Below are the steps to perform for repairing the corrupt Log or LDF files.

• First of all, set your database in emergency mode by following the commands.

ALTER DATABASE <adi> SET EMERGENCY, SINGLE_USER

GO

(Enter the database name instead of adi)

• By executing the above command, you will find the database entered is in Emergency mode.
• After that, click on the New query and execute the command DBCC CHECKDB along with the REPAIR_ALLOW_DATA_LOSS option. (It helps to rebuild the corrupt log files)

DBCC CHECKDB (adi, REPAIR_ALLOW_DATA_LOSS)

If executing the above command, fails to repair corrupt or deleted log files. We suggest users use the accompanying query that helps to rebuild SQL Database with corrupted or deleted log files. To run the accompanying query use the below common by replacing the Log file name, path, etc.

ALTER DATABASE [original_log_file_name] REBUILD LOG ON (NAME= logicalname, FILENAME=’C:\Program Files\Microsoft SQL Server\MSSQLn.MSSQLSERVER\MSSQL\DATA\file_name.ldf’)

2. Rebuild SQL Server Database by a Backup File

To apply this method to repair or rebuild the SQL Server Database, you must have the backup file of your Database. If you have the backup file of your database, then proceed with the further steps.

• Open your system and search for Microsoft SQL Server Management Studio.
• Connect your SQL Server Database by Window or Server Authentication.
• Now, right-click on the Databases folder>>Restore Database.
• After that, you will find a wizard of the Restore Database.
• Check the Device option under the Source section.
• Here, tap the Browse symbol denoted by three dots.
• Again, a new pop-up will appear for Select backup devices.
• Choose the Backup media type as File or URL.
  
• Now, tap the Add button to select the backup file of your database.
• Navigate and Select your SQL Server Database backup file and tap Ok.
• After adding the Database backup file, click the Ok button from the Select backup devices.
• Now, in your Restore database wizard, you can view the details and check for the status Backup file sets to Restore. Click Ok.
  
• At last, you will find the status- database restored successfully in the SQL Server Management Studio wizard.

3. Professional Tool to Rebuild SQL Server Database

Aryson SQL Database Recovery is a reliable and expert suggested utility to repair SQL Server databases effectively. Users can recover minor and severely corrupted SQL Server databases with standard and advanced modes. One can use this highly advanced software to repair and retrieve SQL Server databases with all data such as tables, views, triggers, functions, default, and programmability. Besides, it is compatible with MS SQL Server 2000, 2005, 2008, 2012, 2014, and 2016.

How do I Repair a Corrupt SQL Database?

Follow the mentioned steps to repair a corrupt database.

• Install and Launch SQL Database Recovery.
• Tap the Open button to select the SQL Database MDF file.
• Select the MDF file and tap Open.
• Now, choose the recovery modes and other features of the utility.
• After that, the software will start scanning the MDF files and display the data item in a layered structure.
• Here, view the recovered data items and click the Save button.
• Now, choose the saving options either SQL Server Database or SQL Server Compatible SQL Scripts.
• At last, click Ok to save the repaired and recovered SQL Server Database.

Conclusion

If your SQL database is corrupted or deleted, don’t worry! It is possible to rebuild it from the transaction log file. Here, we have discussed the causes of the corruption in SQL Database files. Moreover, the blog includes two different manual methods to rebuild SQL database with corrupted or deleted log files. Nevertheless, one professional SQL Recovery software to recover corrupt SQL Server databases.

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