SQL Server EMERGENCY mode repair(Check out my online training courses: SQL Server: Detecting and Correcting Database Corruption and SQL Server: Advanced Corruption Recovery Techniques. We can also help you with disaster recovery.)This is a follow- on from two posts: People get themselves into situations where they have no backups (or damaged backups) and the data or log files are damaged such that the only way to access the database is with EMERGENCY mode. In these situations, prior to SQL Server 2. EMERGENCY mode – the only guidance could be found on the Internet or from calling Product Support and paying for help. The sequence of events was: Hack the system tables to get the database into EMERGENCY mode. Use the undocumented and unsupported DBCC REBUILD. The reasons for this were: Much of the advice of how to do this on the Internet missed steps out (particularly missing step 3!)The DBCC REBUILD.
The only repair option allowed in EMERGENCY mode is REPAIR. You can think of this as . The idea behind this is that the database is already inconsistent because either the transaction log is corrupt or something in the database is corrupt in such a way that recovery cannot complete. So, given that the database is inconsistent and we’re about to rebuild the transaction log, it makes sense to salvage as much transactional information as possible from the log before we throw it away and build a new one. Rebuild the transaction log – but only if the transaction log is corrupt.
Run DBCC CHECKDB with the REPAIR. I always advise taking a copy of the database files before doing this in case something goes wrong or there are unrepairable errors. And if it does? Probably time to update your resume for not having a water- tight backup and disaster- recovery strategies in place. I have seen it fail several times in real customer situations. It’s not pretty when it does. EMERGENCY- Mode Repair Example. Let’s walk- through an example of using it.
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I’m assuming there’s a database called Emergency. Demo that’s in the same state as at the end of the second post I link to at the beginning of this post: the database has no log file, is in EMERGENCY mode and the salaries table is corrupt. First off I’ll try bringing the database online, just to see what happens. ALTER DATABASE . The physical file name . See the SQL Server errorlog for details. The current database is switched to master.
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Let’s run EMERGENCY- mode repair. DBCC CHECKDB (N'Emergency. Demo', REPAIR. See the SQL Server errorlog for details. The recovery system knows that recovery has to run on the database but it is unable to start without the log file.
Back to EMERGENCY mode and runing repair. ALTER DATABASE . Database needs to be in single user mode. A database needs to be in SINGLE. You can set SINGLE. Then set EMERGENCY mode and continue with the code below. The physical file name .
Transactional consistency has been lost. The RESTORE chain was broken, and the server no longer has context on the previous log files, so you will need to know what they were. You should run DBCC CHECKDB to validate physical consistency.
The database has been put in dbo- only mode. When you are ready to make the database available for use, you will need to reset database options and delete any extra log files. First of all we get the same error as if we tried to bring the database online – that’s from the code that’s trying to run . Next we get a nice long warning that the transaction log has been rebuilt and the consequences of doing that (basically that you need to start a new log backup chain by taking a full or differential backup). French Drain Around House Installation Prices there.
If there had been any corruptions we’d have seen the usual output from DBCC CHECKDB about what errors it found and fixed. There’s also a bunch of stuff in the error log. Starting up database 'Emergency. Demo'. The physical file name 'C: \Program Files\Microsoft SQL Server\MSSQL. MSSQL\DATA\Emergency. Demo. Diagnose and correct additional errors, and retry the operation. Transactional consistency has been lost.
The RESTORE chain was broken, and the server no longer has context on the previous log files, so you will need to know what they were. You should run DBCC CHECKDB to validate physical consistency.
The database has been put in dbo- only mode. When you are ready to make the database available for use, you will need to reset database options and delete any extra log files.
Elapsed time: 0 hours 0 minutes 0 seconds. Let’s see what happened to our table.