SQL Clone
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


Dead lock not terminated


Dead lock not terminated

Author
Message
Krishna1
Krishna1
Old Hand
Old Hand (356 reputation)Old Hand (356 reputation)Old Hand (356 reputation)Old Hand (356 reputation)Old Hand (356 reputation)Old Hand (356 reputation)Old Hand (356 reputation)Old Hand (356 reputation)

Group: General Forum Members
Points: 356 Visits: 556
Dear All

I have read that sql takes care of dead locks on its own. But when i run following query through SSMS in 2 differnt query sessions it keeps on going

USE AdventureWorks
BEGIN TRAN
UPDATE Person.Address SET AddressLine1 = 'New address' WHERE AddressID = 25
WAITFOR DELAY '0:0:10'
SELECT * FROM Person.Address WHERE AddressID = 20


Am i doing something wrong. I am using sql server 2008 R2

Regards
anthony.green
anthony.green
SSChampion
SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)

Group: General Forum Members
Points: 10200 Visits: 6378
That wont cause a deadlock, that will cause blocking.

You need to do things in a different order, eg 1 query update t1 then t2, other query update t2 then t1



CREATE TABLE t1 (i int);
CREATE TABLE t2 (i int);

INSERT t1 SELECT 1;
INSERT t2 SELECT 9;


/* in one window enter: */
BEGIN TRAN
UPDATE t1 SET i = 11 WHERE i = 1
WAITFOR DELAY '00:00:20'
UPDATE t2 SET i = 99 WHERE i = 9
COMMIT

/* in a second window (another transaction) enter: */
BEGIN TRAN
UPDATE t2 SET i = 99 WHERE i = 9
WAITFOR DELAY '00:00:20'
UPDATE t1 SET i = 11 WHERE i = 1
COMMIT





Want an answer fast? Try here
How to post data/code for the best help - Jeff Moden
When a question, really isn't a question - Jeff Smith
Need a string splitter, try this - Jeff Moden
How to post performance problems - Gail Shaw
CrossTabs-Part1 & Part2 - Jeff Moden
SQL Server Backup, Integrity Check, and Index and Statistics Maintenance - Ola Hallengren
Managing Transaction Logs - Gail Shaw
Troubleshooting SQL Server: A Guide for the Accidental DBA - Jonathan Kehayias and Ted Krueger


Krishna1
Krishna1
Old Hand
Old Hand (356 reputation)Old Hand (356 reputation)Old Hand (356 reputation)Old Hand (356 reputation)Old Hand (356 reputation)Old Hand (356 reputation)Old Hand (356 reputation)Old Hand (356 reputation)

Group: General Forum Members
Points: 356 Visits: 556
Thanks for u quick reply.

I would like to know how do i find if system is blocking? Is there a query by which i can find out that blocking is happning?
anthony.green
anthony.green
SSChampion
SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)

Group: General Forum Members
Points: 10200 Visits: 6378
select * from sys.dm_exec_requests where blocking_session <> 0



Want an answer fast? Try here
How to post data/code for the best help - Jeff Moden
When a question, really isn't a question - Jeff Smith
Need a string splitter, try this - Jeff Moden
How to post performance problems - Gail Shaw
CrossTabs-Part1 & Part2 - Jeff Moden
SQL Server Backup, Integrity Check, and Index and Statistics Maintenance - Ola Hallengren
Managing Transaction Logs - Gail Shaw
Troubleshooting SQL Server: A Guide for the Accidental DBA - Jonathan Kehayias and Ted Krueger


Krishna1
Krishna1
Old Hand
Old Hand (356 reputation)Old Hand (356 reputation)Old Hand (356 reputation)Old Hand (356 reputation)Old Hand (356 reputation)Old Hand (356 reputation)Old Hand (356 reputation)Old Hand (356 reputation)

Group: General Forum Members
Points: 356 Visits: 556
now when tried to test the command given by you, I ran the same quires mentione by me in my first post and it come out on its own with following message


(1 row(s) affected)
Msg 1205, Level 13, State 51, Line 5
Transaction (Process ID 58) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.

Surprising. Why it did not happen when i tried first few times?
Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum

































































































































































SQLServerCentral


Search