Question

SQL Server Transaction Rollback

Asked by: mpdalton

i executed a delete query that ran for about 35 hours before the server rebooted itself.

now that it has restarted i imaging it is rolling back the delete transaction.

i need to know 2 things, can i stop the rollback ?
how do i know when the rollback is finished ?

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Asked On
2006-03-27 at 20:57:44ID21791373
Tags

rollback

,

sql

,

server

,

transaction

Topic

MS SQL Server

Participating Experts
1
Points
500
Comments
8

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Answers

 

by: aneeshattingalPosted on 2006-03-27 at 21:03:09ID: 16307785

mpdalton,
> now that it has restarted i imaging it is rolling back the delete transaction.

If your previous transaction (ur delete statement )  has already committed , then this rollback wont occur..
these two statements can be used to identify the opentransactions

select @@TRANCOUNT

DBCC OPENTRAN

 

by: aneeshattingalPosted on 2006-03-27 at 21:05:03ID: 16307795

mpdalton,
> how do i know when the rollback is finished ?

select @@TRANCOUNT    -- will give '0' if there are no open transactions, after finishing the rollback

same if you use the following too

DBCC OPENTRAN

 

by: mpdaltonPosted on 2006-03-27 at 21:18:55ID: 16307847

this was a rather large delete query that ran, deleting 40 million records from a table with about 150 million.

i can connect to the sql server using em or query analyser, but if i try to get a list of db's using the combobox it just locks up the user interface.

i can go into query analyser and run a command like
USE OKDB
select @@TRANCOUNT

and it works fine, but try
USE RollbackDB
select @@TRANCOUNT

and it just sits there.

the cpu is running at about 25%. could it be rolling back or is the db corrupted ?

 

by: aneeshattingalPosted on 2006-03-27 at 21:28:22ID: 16307892

run
USE Master
GO
dbcc opentran('RollBackDB')

and let me know the results

 

by: aneeshattingalPosted on 2006-03-27 at 21:36:54ID: 16307928

Also run 'sp_who2' to find which are the proceesses running, you need to watch for the columns
DBName ,Command ,ProgramName

 

by: mpdaltonPosted on 2006-03-27 at 21:39:27ID: 16307948

that is still running after 10 minutes.

i think what i might do is stop the sql server
move the data file and log file to another location
restart the server
create a new database with the same name
restore the last backup from before the delete

how does that sound ?

 

by: aneeshattingalPosted on 2006-03-27 at 21:43:41ID: 16307963

yes, that is another option..
If you close that query analyzer window, then you will get a message like, there are some openatransactions.. , then you can select the appropriate option too ...

Also if you you can run the sl_who2 and you can kill the process id which is running in your database ..

 

by: mpdaltonPosted on 2006-03-29 at 13:07:02ID: 16326494

thanks for your help, the machine ended up finishing it's rollback before i took any further action (about 40 hours).

20120131-EE-VQP-002

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