Killing a SPID and Checking Rollback progress in SQL Server
Written By: Armando Prato -- 4/9/2008
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Problem
From time to time, I encounter blocking situations where I end up issuing a KILL command against the blocking SPID. When I run sp_who2, I can see the killed SPID is in a ROLLBACK state. Is there any way I can get an idea of how long the rollback for the SPID will take?
Solution
There sure is! The KILL command offers the WITH STATUSONLY argument which displays an estimation of completion for an in progress ROLLBACK. Using KILL with this argument does not kill a connection; it simply produces a progress report.
Run the following script in a new query window. It captures the connected SPID for the query and displays the fact that the SPID has an open transaction when the script completes:
set nocount on
go
select 'SPID = ' + cast(@@spid as varchar) -- what connection is this?
go
create table test (col1 int identity) -- create a test table
go
begin tran tran1 -- start a transaction
while (1 = 1)
begin
insert test default values
if scope_identity() > 999999 -- break after inserting 1m rows
break
end
go
dbcc opentran(0)
go |
Now open a new connection and issue the following statements to kill the connection we just opened and to examine the connection's state:
Now that we've KILLed the SPID, we can monitor its rollback progress by issuing KILL using the WITH STATUSONLY argument.
As you can see, you can get a good estimation from the server of rollback progress.
Next Steps
- Read about KILL UOW in the SQL Server Books Online
- Read about DBCC OPENTRAN in the SQL Server Books Online
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