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MS-SQL Lock Issues

Posted on 2002-07-09
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Last Modified: 2008-01-16
I created one table with 5 row inserted and index.Now I open two
session(i.e Query analyzer) In First session I start begin transaction and updating 2
rows out of 5 rows but not giving rollback or commit transaction In second session I
am tring to select all records (i.e 5 rows{select * from object}) it is not
responding I come back to first session and apply rollback transaction.Now in second
session record is visible.

Basically I am expecting output in second session is, the two rows which are updated
with old value because it is not commited(like Oracle) and remaining 3 rows which are
not touch by any one.

What I did:- I tried to set isolation level to both session as read commited(I think
it is default but I set it) SET TRANSACTION ISOLATION LEVEL READ COMMITTED GO DBCC
USEROPTIONS GO still second session not showing any think until rollback or commit in
first session. After this I used:- exec sp_indexoption
'Object','DisAllowPageLocks',true exec sp_indexoption 'Object','AllowRowLocks',true
exec sp_tableoption 'Object','table lock on bulk load',false
again second session is not repling back.

How do I solve this problem in Sequel?




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Question by:KanasanRamalingam
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LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 7142607
The problem in SQL Server is that you won't get the old data. Either you have to wait for the end of the transaction of session 1, or you will get the new (uncommitted) values.
By either setting this:
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
or using
SELECT * FROM yourtable (NOLOCK)
you will be able to read the rows with the current values.

CHeers
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Author Comment

by:KanasanRamalingam
ID: 7142806
Hi angellll,

Thank you very much for your comments.

According to your method I'll get the dirty data from the Session 1. Which is very dangerous data.

I would like to have the committed data from the table while the transaction in session 1 is on process.
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Guy Hengel [angelIII / a3] earned 50 total points
ID: 7142834
I know that oracle supports that you get the old data from other sessions, but in SQL this is not possible. One interesting thing in this case is the READPAST hint, which should allow to skip the locked rows. If however there is a session that locks the entire table (eventually by lock escalation), you won't see any rows at all...

CHeers
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Expert Comment

by:CleanupPing
ID: 9280167
KanasanRamalingam:
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