RE: Grabbing sequence values blocks in consecutive order: Need a guaranteed method.

From: Bobak, Mark <Mark.Bobak_at_proquest.com>
Date: Wed, 25 Mar 2009 11:07:30 -0400
Message-ID: <6AFC12B9BFCDEA45B7274C534738067F140DEC7B_at_AAPQMAILBX02V.proque.st>



Um, unless I'm missing something, the approach outlined at the URL below is subject to a classic race condition. This is a really *BAD* idea! Don't do it!

Oracle provides DBMS_LOCK for a reason. Implement DBMS_LOCK in your code, as Riyaj suggested previously, and there will not be an issue. Doing the way it's outlined in that article, (ab)using DBMS_APPLICATION_INFO, is a really bad idea.

-Mark

-----Original Message-----

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of FmHabash Sent: Wednesday, March 25, 2009 11:01 AM To: amar.padhi_at_gmail.com; oracle-l_at_freelists.org Subject: RE: Grabbing sequence values blocks in consecutive order: Need a guaranteed method.

I like this a lot. Will this work with connection pooling where physical connections are being reused.

-----Original Message-----

From: Amar Kumar Padhi <amar.padhi_at_gmail.com> Sent: Wednesday, March 25, 2009 12:01 AM To: oracle-l_at_freelists.org
Subject: Re: Grabbing sequence values blocks in consecutive order: Need a guaranteed method.

Another method would be to make use of application locks to actually create serial access to sequences. This can be achieved by using dbms_application_info to update v$session and then referring this value for releasing resources to one session at a time. I have used this logic in different scenarios to avoid two sessions from using the same resource. has worked perfectly.

http://www.databasejournal.com/features/oracle/article.php/3321961/Use-Oracles-DBMSAPPLICATIONINFO-to-Prevent-Routines-from-Running-Simultaneously.htm

Thanks!
Amar
Www.amar-Padhi.com

-original message-

Subject: Re: Grabbing sequence values blocks in consecutive order: Need a guaranteed method.

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i0zX+n{+i^ Received on Wed Mar 25 2009 - 10:07:30 CDT

Original text of this message