This seems to be one of the many strange errors within SQL Server that you may encounter. You might’ve lately restored this DB from the server where Replication flag would have been enabled – That’s the closest of the scenarios which happened in my case. Although system DB’s were not restored as part of the exercise.
So, here’s what the error message will scare you with:
One or more recovery units belonging to database ‘mydatabase’ failed to generate a checkpoint. This is typically caused by lack of system resources such as disk or memory, or in some cases due to database corruption. Examine previous entries in the error log for more detailed information on this failure.
The log scan number (643555:241:0) passed to log scan in database ‘ mydatabase ‘ is not valid. This error may indicate data corruption or that the log file (.ldf) does not match the data file (.mdf). If this error occurred during replication, re-create the publication. Otherwise, restore from backup if the problem results in a failure during startup
Couple of options to start with:
- Check within the sys.databases table and see if the log_reuse_wait_desc is marked with Replication. If so, then we must work to get rid of it.
SELECT name, log_reuse_wait_desc FROM sys.databases where log_reuse_wait_desc = ‘Replication’
- You may execute this stored procedure to remove replication from this DB if you’re sure that it’s not a replication participating DB.
EXEC sp_removedbreplication ‘mydatabasename’
- After executing #2, if DB entry is still showing up in sys.databases table within log_reuse_wait_desc as ‘Replication’ then try marking the transactions as replicated using this command:
EXEC sp_repldone @xactid = NULL, @xact_segno = NULL, @numtrans = 0, @time = 0, @reset = 1
- After executing #3, if you’re still hitting up this error, then advise would be to install Replication component using the setup.exe and put the DB into publication (Use any dummy table) and then remove replication using the same command as mentioned in #2.
Off course, prior going into this series of steps you’ll have to verify a certain things respective to your environment:
- Ensure that database integrity is rightly checked and validated.
- Error log is rightly checked and there are no more errors available there, apart of this one.
- Server resources are available in plenty.
- Clean restoration was performed earlier while bringing this DB online.
Hope this helps!