Model database log file corrupt

In this series of articles see the TOC below , we described the Transaction Log concept from four different aspects. In the first articles group, we described the main concept of the SQL Server Transaction, dived deeply the internal structure of the SQL Server Transaction Log, and the vital role that the Transaction Log plays in keeping the database in a consistent state and recovering the corrupted database or mistakenly modified table to a specific point in time.

After that, we went through the three recovery model types, Full, Simple and Bulk-Logged, that controls how the transactions are written to the SQL Transaction Log file, and the relationship between the SQL Server Transaction Log and the different types of high availability and disaster recovery solutions.

After building a good understanding background about the SQL Transaction Log, we discussed how to manage and monitor the SQL Server Transaction Log file growth, the different operations that can be performed on the Transaction Log, such as the log backup, shrink and truncate operations and finally the list of best practices that should be performed by the database administrators in order to keep the SQL Transaction Log in healthy state.

Finally, we discussed how to take advantages from the logs that are automatically written to the Transaction Log in Undoing or Redoing a specific data modification process. If the reading process or the recovery process fails, the database will not be brought online and will be marked as Suspect or Recovery Pending , based on the failure stage.

If any hardware issue detected, contact the system administrator or the hardware vendor to fix the issue for you. Step 4: Once the file is selected, click Repair to initiate the repair process. Step 5: The software provides preview of repaired database file in a tree-view list on the left panel of Preview window. Step 6: Select all or specific database objects you want to recover, and then click Save on Home menu.

Step 8: Fill in the required details under Connect to Server section, and then click Save. SQL Server database transaction log file becomes corrupt due to several reasons, including unclean shutdown of the database, hardware fault, large-sized LDF file and virus attack.

A corrupt log file can make the database inaccessible. You can try restoring the database from the last known good backup. But, keep in mind, restoring database from backup may cause data loss depending on the recovery strategy in place.

But this command has certain limitations. It may fail to fix major corruption in SQL Server database and returns an error. For instance, you may receive the following error when trying to repair a severely corrupt database file:. The command first attempts to use the log file to recover from any database inconsistencies. Secondly, if the log is missing it helps rebuild the transaction log file. Priyanka is a technology expert working for key technology domains that revolve around Data Recovery and related software's.

Loves to write on different technology and data recovery subjects on regular basis. Technology freak who always found exploring neo-tech subjects, when not writing, research is something that keeps her going in life. Stellar Converter for Database is an eff Read More. Stellar Data Recovery Blog.

Recovers deleted files, photos, videos etc. Database Recovery. Written By. Priyanka Chauhan. Online Marketing Executive at Stellar. She has more than 5 years' of experience in the data recovery industry. Specifically, she has knowledge of data recovery services, photo recovery software, and SQL Repair software. She has been successful in creating a blend of her hard skills and soft skills and utilize it effectively in her domain area of expertise.

Your email address will not be published. Summary: This post outlines reasons that may turn a SQL database transaction log file corrupt. What Causes Log File Corruption?

Some common reasons that may lead to corruption in the transaction log files are as follows: The log file has exceeded its configured size limit Log file is damaged due to virus or malware attack System terminated without cleanly shutting down the database Log file gets corrupt due to hardware failure Solutions to Recover Database with a Corrupt Log File Follow the given solutions to repair and recover the SQL Server database with the corrupt log files.

But, it may result in data loss. The database will be set to Offline mode. Rename the corrupted log file.