RE: Active locking of DB rows

Dennis,
While I agree with both Prasad Muppirala, and Thomas Mercer Hursh, I also
recognize the business requirement listed in your letter to avoid changing
other applications that use the same database tables. I can think of two
possible solutions to your dilemma:
1) Follow the path that you have described, using individual DBSessions - I
think that there is a paper by Diana Quintal of Forte that may describe a
similar scenario. It should talk about building your own router, and using
separate sessions.
2) Consider the Distributed option in the Oracle server. In this case, you
might distribute the tables to two instances, or even to two separate table
owners, and use Oracle to manage the synchronization of data. While this
may not help if the apps have real-time, up-to-the-second data needs, it
would definitely allow you to build a Forte application that is more on the
shared DBSession model, so that you would not need to change it as you
migrate other applications to Forte.
Without more review of your situation, I'm afraid I have no more
suggestions, but please feel free to contact me if you wish.
Good luck,
Brian Wilson
From: Wetzel, Dennis R
To: 'Forte-Users'
Subject: Active locking of DB rows
Date: Saturday, March 29, 1997 10:13AM
I have a customer who has a requirement to do active DB locking (Oracle
7.x). Their current applications are written in Oracle Forms 3.0. The
behavior in the current applications is that when a user begins to edit
information via an Oracle Forms application the underlying DB records
are write locked, thus preventing any other user from changing those
records until the first user completes their transaction. Because other
applications, not written in Forte, will be accessing the DB, we need to
use the DB locking mechanisms to manage locks (i.e. we can't change the
existing applications). Our original intent was to use shared
DBSessions that were created from a DBResource Manager at application
startup to provide access to the DB. We are willing to incur the
overhead of creating individual DBSessions as users login to the
application (each user will have an Oracle account). I've just begun
looking into possible solutions, any ideas are greatly appreciated.
Thanks,
Dennis Wetzel
C/Soft, Inc
Carmel, IN

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Edited by: Abdul Halim on Oct 26, 2009 2:43 AM

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RE: Active locking of DB rows

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