How to Repair SQL Server Database with a Corrupt Log File

Admin | Published: 2020-11-18T11:48:42+00:00 | SQL Server

Summary: There are many users who are searching for a quick solution to Repair SQL Server Database with a Corrupt Log File. After considering the issue, we have come up with efficient approaches to resolve this problem without losing a bit of information. Simply, go through the upcoming segments and get complete knowledge about how Repair SQL Server Database with a Corrupt Log File and the reasons behind the log file corruption.

Introduction

The SQL database log file, also known as transaction log file (.ldf). It keeps the record of everything down to the SQL database for rollback purposes. There are one or more log files associated with each database, which maintain the log of all the transactions. Along with MDF and NDF files, Log file is also a major part of the SQL database, that directly affect the smooth running of the SQL server. If any file of the SQL database has a problem, the SQL server will stop working correctly.
Therefore in this post, we are going to discuss how to Repair SQL Server Database with a Corrupt Log File. Now, let us start by understanding the possible causes of this issue.

Potential Reasons for Log File Corruption

Sudden System Shutdown: Abrupt power cut or sudden shutdown can be the reasons responsible for the log file corruption.
Storage Issue: Transaction log file has limited storage space, once it exceeding its limit chances of corruption increase.
Hardware Issue: Sometimes, hardware that helps to store and run the database can get damaged badly. In that case, the chances of corruption increase.
Virus Attack: SQL server database got affected by viruses and malware which results in corrupt log file.

How to Fix SQL Server Database with a Corrupt Log File By Effective Manual Technique?

Note: Before executing the process first check the SQL Server error logs and event logs of the Windows system and application facilitating the database. In case if you find any hardware issue, get it fixed first and see whether the corruption has been resolved or not. If not, then follow the methods to repair SQL server database with a corrupt log file.

Method 1 – Restore Database from a Valid Backup

Step 1: Launch SQL Server Management Studio (SSMS) on your system.
Step 2: After that, expand the Databases folder in Object Explorer.
Step 3: Right-click the Database that you want to restore and then choose the Restore Database option.
Step 4: In the Restore Database screen, under Source for restore section, click From device option and then click the browse button.
Step 5: Now, in the Specify backup window, select the Backup media type, and click on the Add option.
Step 6: Select the backup file you want to restore and click on the OK button.
Step 7: The backup file will be listed on the Database restore window.
Step 8: Now, select Options under Select a page in the Restore Database wizard.
Step 9: Finally, select one of the checkboxes under the Restore Options screen and hit the Ok button.

Method 2 – Rebuild Corrupt Transaction Log File

By rebuilding the corrupt log file to you can make the database accessible again. To do so, follow the below-mentioned steps:

Step 1: Set the database in EMERGENCY MODE by using the following command:
ALTER DATABASE SET EMERGENCY, SINGLE_USER
GO
Step 2: Once the database is set to a single user mode, execute the DBCC CHECKDB command with REPAIR_ALLOW_DATA_LOSS option to repair the corrupt transaction log file.

Important note: Before using this repair process, take a backup of your database, because REPAIR_ALLOW_DATA_LOSS option can cause data loss problems sometimes.

DBCC CHECKDB (‘’, REPAIR_ALLOW_DATA_LOSS)

If corruption is still there then, use this command to rebuild the log file. Set the database in Offline mode and then change the name of the corrupted Log file related to it. Now, run the below-mentioned command:

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’)

Method 3 – Best Alternate Solution to Repair SQL Server Database with a Corrupt Log File

The above-discussed manual methods involve a lot of brainstorming effort and they are complex to execute. If you want a simpler and quick solution to Repair SQL Server Database with a Corrupt Log File then use this SQL Recovery software. It is an enterprise-grade level software that is capable to fix all minor database corruption issues in just a few minutes without any change in the original content. It can also recover all SQL database objects including Tables, Indexes, Functions, Values, Keys, Views, Rules, Triggers, Stored Procedures, and so on.

Download Purchase Now

This software is equipped with an advanced feature to recover and preview deleted SQL database objects and table records in Red color. Moreover, users can also export the recovered data to the SQL server database or as SQL compatible script. This application supports all the versions of MS SQL Server such as 2019, 2017, 2016, 2014, and below.

Follow the below-mentioned steps to Repair SQL Server Database with Corrupt Log File

Step 1. Download and launch the software on your system and click Open to load the SQL MDF file.

Add MDF file

Step 2. Choose Scan Mode (either Quick or Advance) for scanning and then select the SQL Server version of the MDF file either manually or automatically, also check the Recover Deleted Objects option to recover the deleted database objects.

Step 3. Preview the recovered SQL database objects like triggers, rules, tables, etc., and then click the Export button.

preview database

Step 4. After that, fill all the export details and hit the Export button.

hit export button

Final Words:

Well, this write-up provides complete information on how to Repair SQL Server Database with a Corrupt Log File. Both manual and automated methods are mentioned here, but the manual method does not appropriate for professional use as it involves a lot of brainstorming effort.
Therefore, we always recommend you to go for the automated solution that can repair the SQL Server Database with Corrupt Log File in just a few simple clicks. You can download the free trial version to check the working of the Software