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Re: lock Oracle db objects, but only a lock for others?

From: Bob Kilmer <rprgrmr_at_yahoo.com>
Date: Sun, 20 Apr 2003 19:01:19 GMT
Message-ID: <38Coa.57548$D15.1636488@twister.tampabay.rr.com>


Dan,
Are you trying to say I am asking too much of this newsgroup?

Bob
"Daniel Morgan" <damorgan_at_exesolutions.com> wrote in message news:3EA2E831.F3D5B301_at_exesolutions.com...
> Bob Kilmer wrote:
>
> > >expect that the entire code base needs to be rewritten
> >
> > I agree but this is not practicable. Not only that, without learning
> > something, we are likely to write something only a little better or
merely
> > with different foibles. As it is, I hope to make an admittedly bad
situation
> > less bad. Can any one address my questions directly? Some of the are
yes-no
> > questions. Surely someone can manage that.
> >
> > Bob
> >
> > "Daniel Morgan" <damorgan_at_exesolutions.com> wrote in message
> > news:3EA2DF84.6075EA5_at_exesolutions.com...
> > > Bob Kilmer wrote:
> > >
> > > > Jim,
> > > > Thanks for your response. I am new to the app and the company. I
didn't
> > > > invent the locking and unlocking chaos, I am trying to cure it. I do
> > read
> > > > the docs online and I will look at what you suggest, but it takes a
> > while
> > > > for it all to sink in and to find just the right answer and not just
a
> > > > generic lesson in locking database objects.
> > > >
> > > > Now that I've finished being defensive, let me say the locking that
the
> > code
> > > > uses is a 'select for update', sometimes with and without a nowait,
> > between
> > > > a begin trans and commit or rollback. But the code places a lock
that
> > gets
> > > > in its own way! So it commits (or rollsback - who knows - On Error
> > Goto!) to
> > > > release the lock when it passes control to whatever code it thinks
might
> > > > need access to the data that it would prefer to remain locked. And
that
> > code
> > > > sets a lock again. (Or should. Or maybe not?) And this happens again
and
> > > > again as the client opens and closes form after form getting or
posting
> > > > data, locking and unlocking data, starting and ending transactions,
> > before
> > > > the finally the process is through.
> > > >
> > > > Besides all that, the app doesn't really lock all the data up for
grabs.
> > The
> > > > app really just locks a mutually agreed upon row in a particular
table.
> > This
> > > > lock then serves as a flag to other instances of the app not to fool
> > with
> > > > the data. Not that one couldn't fool with the other data that is not
> > locked.
> > > > So if all the clients are using this as a flag, they may as well use
an
> > > > explicit flag, i.e., a flag table value, unless the app can set a
> > reasonable
> > > > lock that won't get in its own way, don't you think?. Intuition
tells me
> > > > that this lock, unlock, lock unlock madness is bogus, especially
when it
> > > > encumbers the code so, and isn't really locking all the data that is
> > > > exposed.
> > > >
> > > > Should the client be using db locking at all?
> > > >
> > > > Can the client set a legitimate lock that won't get in its own way?
> > > >
> > > > Would it be just as well to set a flag in a table of flags? (That
is, in
> > > > effect, what is being done now - except it is a table of real data!)
> > > >
> > > > Is there another option that is cleaner, easier and more
professional
> > that I
> > > > have yet to discover?
> > > >
> > > > I would prefer to be able to set a lock or a flag exactly once at
the
> > > > beginning of a client input or edit process, do the input or editing
> > > > machinations, then unlock or lower the flag (once) when I am out of
> > there.
> > > >
> > > > Regards,
> > > > Bob
> > > >
> > > > <snipped>
> > > >
> > >
> > > I'm just guessing based on things in your post but what catches my eye
are
> > > things like:
> > >
> > > begin trans
> > > On Error Goto
> > >
> > > If things like this have been written expect that the entire code base
> > needs to
> > > be rewritten.
> > >
> > > Daniel Morgan
> > >
> > >
>
> Then hire someone to train your staff.
>
> I can certainly suggest someone that can fly to where-ever you are and do
so.
>
> You will learn more and save money with an on-site instructor for one week
or
> two weeks.
>
> If you are interested in pursuing this option one person I can recommend
is Jack
> Cline. You can email him at jcline_at_deltabravo.net.
>
> Daniel Morgan
>
>
Received on Sun Apr 20 2003 - 14:01:19 CDT

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