The transaction log in the SQL Server represents the details of actions of past, performed by the application. This holds all the information of the changes done to the database, when it is in active state. Now if due to user’s faults or any other cause, the database comes to the inconsistent or corrupted state, this transaction log can be reviewed so as to un-commit transactions and roll back the changes and hence can be used to attempt SQL recovery.
The transaction log backing up during database corruption
Now as the transaction log can be used to solve some of the problems, due to which the database has undergone corruption, backing up the file even in the state of corruption would greatly help. If the file is still available, then this file can be backed up and used as such. For the process, the presence of primary data file is also necessary.
The first approach should be made for getting it from master database. But if it is also corrupted, then restore it from the backup and then backup the last active transaction log and in case the last backup of the master database is not available, then the more complicated process is needed to be applied.
For this, the transaction log files can firstly renamed and the master database is rebuilt. After this, a similar database containing the same number of data and log files is created and the SQL Server is stopped. Then the data files of the new database are deleted and its log files are replaced with that of original one. After restarting the SQL Server, the backup command is run and sp_dbremove stored procedure is run to remove the database.
The backed up transaction log gives you few chances of MDF recovery, as this is valuable for reverting the corruption state in few of the instant database corruption scenarios. However, there are many cases in which SQL repair can’t guaranteed by rolling back the last transactions like in case of virus attack.
For having MDF repair in such cases, the use of third party applications are meant. To meet the SQL recovery needs, the SQL recovery software are designed so as to run the effective scanning algorithms to repair and restore the corrupted database.
The SQL repair is taken in granted through the interactive part of the software – the user interface. These MDF repair utilities are valuable for different cases of corruption.
Stellar Phoenix SQL Database Recovery software is the one which can do a complete SQL repair and restoration of the affected database. This MDF recovery software offers the most interactive user interface and holds the great scanning ability.
The software creates the script files after the repair has been made. This read-only and non-destructive SQL recovery application is valuable for all the corruption issues.