Checkpoint is blocking other processes (background checkpoint)

Posted on 2009-04-01
Last Modified: 2012-06-21
Hi Experts, I ran SP_Who (since the server is crawling) and saw spid10 (checkpoint) is running in the background, it cannot be killed since it is not a user sp... but nothing else works (tried to do dbcc checktable and is being blocked by that spid10,) all selects from that table timeout as well... how do I fiX

Question by:sir-rob
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LVL 21

Expert Comment

ID: 24041603
You're right.  It cannot be killed.  Your only option may be to stop and start SQL services.  



Author Comment

ID: 24041755
thanks Greg, do you think since checkpoint is stuck, I am going to have loss of data?
LVL 21

Accepted Solution

JestersGrind earned 500 total points
ID: 24042058
There are several events that cause a checkpoint.  One of them is shutting down SQL server.  So, it will try to checkpoint when you restart SQL.  I'm honestly not sure what it will do if it can't checkpoint.  

I just had another thought.  You can manually force a checkpoint by running the CHECKPOINT command.  You might want to try that first.

To answer your question, you shouldn't experience any data loss.  The transactions are stored in the transaction log.  Upon restart SQL will read the transaction log and either rollback the uncommitted transactions or re-execute the committed transactions to get the SQL server back to its original state when it was shutdown.


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Author Comment

ID: 24042135
I tried manual checkpoint but it doesn't work... when I check the activity monitor, it shows that spid 10 is blocking it... (which is the same checkpoint when i run sp_who)...

the database is in simple recovery mode, would that still work with restarting the database and reading it off of transaction log?

LVL 21

Expert Comment

ID: 24042403
The recovery model doesn't matter at this point.  This is a core function of SQL server to maintain data consistency.  



Author Comment

ID: 24042543
Ok, I am gonna try and see where It ends up

Thanks for help!

Author Comment

ID: 24043877
Greg, thanks for your help, much appreciated


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