MS SQL is a well known relational database management system produced by Microsoft for efficient management of data. With the help of SQL server, you can store and manage huge amount of data and can also modify it depending on your needs. It makes use of Transaction log which is integral module of SQL Server instance. It keeps track of all modifications that takes place in database and store them in separate files so that you can easily access them anytime. Transaction log also acts as backup file which you can use for restoration purpose in case of any type of damage to database. But often it happens that the log gets corrupt and gives rise to SQL error 9004 when you try to access it.
As, Transaction log offers facility to perform database recovery in case of any damage or corrupted SQL server. Further, most of the SQL users use it in order to retrieve the database to its original state. But, sometimes it fails to perform its task. Consider a situation when you attempt to access Transaction log to recover your damaged database but you are unable to do so due to following error message:
Error: 9004, Severity: 21, State: 1.
An error occurred while processing the log for database ‘mydb’. If possible, restore from backup. If a backup is not available, it might be necessary to rebuild the log.
SQL error 9004 disallows you to perform database recovery because transaction log has been corrupted. In such cases despite of using various efforts you are unable to restore your database using this log. In such cases you can perform SQL recovery only when you repair the damaged database and transaction log. But before repairing the log you should know the exact cause that gives rise to this error in Windows Application Event Log.
Reasons behind occurrence of SQL Error 9004
There can be various reasons that can corrupt Transaction log and gives rise to errors. Some of them are as follows:
- Corrupt .mdf file
- Damaged file headers
- Use of outdated device drivers
- Improper functioning of hardware
- Damaged file system structure
- Defect in SQL engine
- Virus attack
How to Fix SQL Error 9004
In order to resolve this error you need to perform following steps:
- Restore the database from backup. It can be done by creating new empty database with the same name. Then replace all the files to the new database.
- Rebuild the log by creating new database using Create Database for Attach_Rebuild_Log command.
This might fix the problem. But, even if you are getting same error then use DBCC CHECKDB REPAIR_ALLOW_DATA_LOSS command to repair damaged database and bring back to original state. In this way you will be able to resolve the problem but it might cause data loss. So, it is advised to repair damaged database using effective third party software. You can use MS SQL Database Repair software using which you repair and restores corrupt SQL database easily and effectively. Its advance algorithm will really proves to be boon for the users. Hence, try it and get rid from annoying SQL error 9004.