Tuesday, July 1, 2008

Recreate Corrupt MSDB database

If your msdb goes suspect then you have two choices, restore it from a backup or recreate it (and then recreate any scheduled jobs). Obviously everyone has a comprehensive and valid set of backups, right? If only...

Of course, the very first thing you do is work out why it went suspect in the first place and take any necessary steps to stop it happening again.

Now you'd hope that if you don't have a valid msdb backup then you can at least run repair on it and so you don't lose everything in there. Well, that works as long as the transaction log isn't damaged. Ok, but then surely we can stick the database into the now-documented emergency mode (alter database dbname set emergency) and run emergency mode repair? (dbcc checkdb (dbname, repair_allow_data_loss) in emergency mode). Nope, msdb can't be put into emergency mode.

So, you're out of options and you're going to have to recreate msdb. Here's what to do (change the directory paths to suit your installation):

Detach the damaged msdb. You can't just detach msdb because you're not allowed to detach system databases. However, you can if you start the server with trace flag 3608. I did this by shutting down the server, navigating to the directory 'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Binn' and doing the following: start sqlservr.exe -c -T3608

Move or rename the damaged msdb files (msdbdata.mdf and msdblog.ldf in the 'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data' directory)

Run the instmsdb.sql script in the 'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Install' directory

Shutdown and restart the server without the 3608 trace flag

This works on SQL Server 2000 as well.


  1. if u have a back restore it on ur test server which has the same sqlserver and spack installed ...... stop ur sqlserver services copy the mdf and ldf file from the test server and paste it into ur crupt msdb server and remove the currupt mdf and ldf files from the server and then restart the service it will work ... i hav done this

  2. Didn't work here.
    SQL 2000
    Database 'msdb' cannot be opened due to inaccessible files or insufficient memory or disk space. See the SQL Server errorlog for details.

  3. At what stage did you face this error. I mean when trying to detach or recreating the databse? Please check your sql error logs as mentioned by the error message so that you find the exact reason.

    What the article suggests is that your msdb is corrupt and you do not have any backups then you need to recreate the database from scratch.

    Please check the sql logs and follow the steps as mentioned in the psot (i.e. recreate the msdb database). Post me any errors you face and I will try a fix.

  4. Thanks for the helpful post!

    The one kink I ran into was that I had to use sp_detach_db 'msdb' in Query Analyzer as Detaching wasn't an option in the GUI for my suspect database.

  5. I have heard about another sql mdf repair tool. Besides, you can visit my blogs at: http://daspeac.livejournal.com/ or http://daspeac.blogspot.com/ where I’m trying to share my experience with regard to data corruption issues.

  6. My friend has used this sql database recovery software to recover the sql server database.

  7. Hi Adeel, when I tried the first step it refused to run sql server, "Your SQL server installation is either corrupt or has been tampered with (Error getting instance ID from name.).

    But the SQL 20005 does work, so anyhow can't move forward. My MSDB was reporting errors during a hotfix.

    Any ideas?

  8. our sql 2008 server reastart & after restart msdb database going suspect, & msssql agent service not start why? this process is running three times in day.

  9. Original Post by Paul Randal....http://blogs.msdn.com/b/sqlserverstorageengine/archive/2006/06/06/619304.aspx

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