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Home » Article Discussions » Article Discussions by Author » Discuss content posted by Sriram » Transactions
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ppcx
Posted Thursday, March 19, 2009 8:26 AM
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As a long-time Oracle DBA and a new MSSQL DBA I find this whole concept mind-boggling. If it hadn't been for the prior isolation-level question (which I missed) and then yesterday's (Guest) Editorial I would've gotten today's question wrong too.
Post #679465
LGibson69
Posted Thursday, March 19, 2009 8:36 AM
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I expected to get no records because the transaction was still open but, when I ran it on SQL 2008 I got an error message saying "Msg 208, Level 16, State1, Line 3. Invalid object name 'test_tran'. Since this is the actual result I got I selected "None of the above" as the correct answer and was told I was wrong. I think I should get my "point" because my answer was technically correct.
Post #679478
Bob Griffin
Posted Thursday, March 19, 2009 8:42 AM


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Good question because it made us think....I missed it, but I learned something which is really the point....It's very tough to cover all your bases on these questions....
Post #679486
JF1081
Posted Thursday, March 19, 2009 8:56 AM
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Mine ran for a while with no results so being the impatient person I am I decided to see what would happen if I ran the first one again. Upon doing so it returned the first 2 rows (1 and 2) in the second query.
I am using SQL Server 2005.
Post #679508
h84liang
Posted Thursday, March 19, 2009 9:10 AM
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dear Friends,

i have testing this question and return all values (1,2,3) if i execute it

thx
Post #679525
SanjayAttray
Posted Thursday, March 19, 2009 9:11 AM
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Good question. I didn't read it correctly and executed in same window. Which gave me 1,2,3 but after it got wrong, then tried it in another window and it was still running.

Will see if it returns something after sometime.

SQL DBA.
Post #679530
SanjayAttray
Posted Thursday, March 19, 2009 9:12 AM
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h84liang (3/19/2009)
dear Friends,

i have testing this question and return all values (1,2,3) if i execute it

thx


Dude, read question correctly. It say's execute it in another window and not the same.
Try again.

SQL DBA.
Post #679536
DPhillips-731960
Posted Thursday, March 19, 2009 10:42 AM
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Sometimes missing information in a question induces thought, teaches, and also helps one to permanently retain what was learned.

I think this was a great question, and also the points brought out in discussion.
Post #679655
Lynn Pettis
Posted Thursday, March 19, 2009 11:02 AM


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LGibson69 (3/19/2009)
I expected to get no records because the transaction was still open but, when I ran it on SQL 2008 I got an error message saying "Msg 208, Level 16, State1, Line 3. Invalid object name 'test_tran'. Since this is the actual result I got I selected "None of the above" as the correct answer and was told I was wrong. I think I should get my "point" because my answer was technically correct.


I am guessing you are running in a case-sensitive environment. I am too and had the same error. I corrected the second query to use the same EXACT name as the first. I then had the proper result (based on SNAPSHOT ISOLATION being OFF).


Lynn Pettis

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Post #679678
kevin.l.williams
Posted Thursday, March 19, 2009 11:10 AM


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At first I was confused about why it would not return the already committed data and I did an experiment by changing the code. Very interesting question. Thanks!

--first window
CREATE TABLE Test_Tran(id int identity, col1 int)
ALTER TABLE Test_Tran ADD CONSTRAINT [pk_Test_Tran] PRIMARY KEY CLUSTERED (id ASC)
insert into Test_Tran values(1)
insert into Test_Tran values(2)
Begin Tran
insert into Test_Tran values(3)

--second window
SET TRANSACTION ISOLATION LEVEL READ COMMITTED
select * from a_test_tran where id < 3

--results
id col1
----------- -----------
1 1
2 2

(2 row(s) affected)


Post #679685
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