Oracle to update without waiting

Hi all..

Can you a pls tell me in which case we must use to update without waiting in the sliders.
my understanding is to activate locks on top of records selected by the cursor using for update.
but haven't knowlodge on the NOWAIT clause. Can pls tell me exactly in this case you must use the nowait clause.

Thanks in advance,
Sanjeev.

Hi Hassan,.

There are 3 choices

1 NOWAIT, you set this, if you do not want to wait for the locks.
Enough if 1 rank is not available to you, you will get an ORA-54.

2. you can wait until ' n seconds. After "n" seconds, you do not have the lines
you will get an ORA-30006.

3 new feature - officially - in Oracle 11 g! SKIP LOCKED!
Sometimes it's good for us that one TRIES to lock all lines, but not problem, if there is some lines
which are available to us.
In this case, we are changing all that remaining availabe lines will be ignored.
Later - maybe - we try to repeat our process for the remaining lines.
Of course, we mark our lines changed in some way (e.g. with flag)
Note that this feature is available in Oracle 10 g (unofficially)!

Best regards
Laszlo
(Trainer SQL and PL/SQL in Hungary)

Tags: Database

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