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DELETE running for 8 hours need to Stop the process


DELETE running for 8 hours need to Stop the process

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Welsh Corgi
Welsh Corgi
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Someone execute a DELETE query and it has been running for for 8 hours need to Stop the process.

If I kill the SPID it will take at least 8 hours to rollback.

What options do I have?

ROLLBACK IMEDIATE, NO_WAIT?

Any help would be greatly appreciated.

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GilaMonster
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Wait for it to finish or stop it and wait for it to rollback. That's pretty much it.

Or drop the database and restore from backups.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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Welsh Corgi
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The Transaction Log Backup is 145 GB. Tried shrinking it but it did not make much of a difference.

They tried canceling the Query from SSMS and closed the window so I can not stop the query.

What about ROLLBACK IMMEDIATE?

If I kill the process it will take at least 9 hours to rollback.

If I restart SQL Server Service that could corrupt the Database.

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GilaMonster
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Welsh Corgi (11/6/2013)
The Transaction Log Backup is 145 GB. Tried shrinking it but it did not make much of a difference.


No, it won't because there's no free space in the log because of an active transaction (the delete). Shrink removes unused space, if the log is growing then it follows there's no unused space for shrink to remove.

They tried canceling the Query from SSMS and closed the window so I can not stop the query.


You can use the KILL command to cancel the query and start a rollback, though if they tried cancelling from SSMS it it's probably already in rollback.

What about ROLLBACK IMMEDIATE?


From Books Online (ALTER DATABASE)

Specifies when to roll back incomplete transactions when the database is transitioned from one state to another. If the termination clause is omitted, the ALTER DATABASE statement waits indefinitely if there is any lock on the database. Only one termination clause can be specified, and it follows the SET clauses.

ROLLBACK AFTER integer [SECONDS] | ROLLBACK IMMEDIATE
Specifies whether to roll back after the specified number of seconds or immediately.


The IMMEDIATELY is when to start any necessary rollback.

If I kill the process it will take at least 9 hours to rollback.


Probably yes, maybe longer.

If I restart SQL Server Service that could corrupt the Database.


No it won't. It will however continue the rollback after the restart, with the database unavailable.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
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Welsh Corgi
Welsh Corgi
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I restarted SQL Server Service.

It is at 0% recovered. Not moving.

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GilaMonster
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Hope no one needs to use that database for the next several hours...

As I said, if you restart, the rollback will continue with the database unavailable. It'll be unavailable until the recovery completes, however long that is.

Or you can drop the database and restore from backups, assuming you have backups that will allow you to restore up to present.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
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Abu Dina
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Welsh Corgi (11/6/2013)
I restarted SQL Server Service.

It is at 0% recovered. Not moving.


Let's hope you've got fast disks:-)

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Welsh Corgi
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Recovery at 88% Complete.

Keeping my fingers crossed. :-)

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Welsh Corgi
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Recovery completed.

Thanks for the help.:-)

For better, quicker answers on T-SQL questions, click on the following...
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For better answers on performance questions, click on the following...
http://www.sqlservercentral.com/articles/SQLServerCentral/66909/
GilaMonster
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Next time don't restart SQL while there's a large transaction rolling back.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass


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