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Questions about ROWLOCK and Transaction Handling

Posted on 2006-11-28
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Last Modified: 2008-01-09
Dear Sir,
  The SQL statement:
     SELECT TITLE, DESC
      FROM BAEXP_TITLE
        WITH (UPDLOCK, ROWLOCK, NOWAIT)
      WHERE COMPANY = 'ABC' AND TITLE = 'XYZ'

  Questions:
  1. Does (UPDLOCK ROWLOCK NOWAIT) without comma also work ?
  2. What is the diffrence between (UPDLOCK, ROWLOCK) and (UPDLOCK, ROWLOCK, NOWAIT) ?
  3. Does SQL Server 2000 support multiple transactions ? If so, any settings need to be done first ?

Thanks for you help!
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Question by:daniel710624
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5 Comments
 
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Expert Comment

by:imran_fast
ID: 18035376
1,  No for each hint you have to provide comman in between
2, The first one also include nowait hint along with UPDLOCk and ROWLOCK
3. Yes, No
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LVL 28

Expert Comment

by:imran_fast
ID: 18035378
>>Does SQL Server 2000 support multiple transactions ?
What to you mean like multi user environment.
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Author Comment

by:daniel710624
ID: 18035719
>>Does SQL Server 2000 support multiple transactions ?
>>What to you mean like multi user environment.
I mean can I start two transactions with different TransactionID at the same time?
A nested transactions looks like :
  START TRANS 1
    DO PROCESS1
    START TRANS 2
      DO PROCESS2
    IF PROCESS2 COMPLETED THEN
      COMMIT TRANS 2
    ELSE
      ROLLBACK TRANS 2
  IF PROCESS1 AND PROCESS2 COMPLETED THEN
    COMMIT TRANS 1
  ELSE
    ROLLBACK TRANS 1
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Author Comment

by:daniel710624
ID: 18035738
>>1,  No for each hint you have to provide comman in between
But there was no error occured when executed the statement without comma...That confused me!
So, (UPDLOCK, ROWLOCK, NOWAIT) is the correct one!
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Accepted Solution

by:
imran_fast earned 500 total points
ID: 18036344
>>So, (UPDLOCK, ROWLOCK, NOWAIT) is the correct one!
yes

No for such transactions it will be in a serial.
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