Solved

MS-SQL Lock Issues

Posted on 2002-07-09
5
368 Views
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?




0
Comment
Question by:KanasanRamalingam
  • 2
5 Comments
 
LVL 143

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
0
 

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.
0
 
LVL 143

Accepted Solution

by:
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
0
 

Expert Comment

by:CleanupPing
ID: 9280167
KanasanRamalingam:
This old question needs to be finalized -- accept an answer, split points, or get a refund.  For information on your options, please click here-> http:/help/closing.jsp#1 
EXPERTS:
Post your closing recommendations!  No comment means you don't care.
0

Featured Post

Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction In my previous article (http://www.experts-exchange.com/Microsoft/Development/MS-SQL-Server/SSIS/A_9150-Loading-XML-Using-SSIS.html) I showed you how the XML Source component can be used to load XML files into a SQL Server database, us…
Everyone has problem when going to load data into Data warehouse (EDW). They all need to confirm that data quality is good but they don't no how to proceed. Microsoft has provided new task within SSIS 2008 called "Data Profiler Task". It solve th…
Via a live example, show how to backup a database, simulate a failure backup the tail of the database transaction log and perform the restore.
Viewers will learn how to use the SELECT statement in SQL and will be exposed to the many uses the SELECT statement has.

829 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question