Re: Records written not seen by called program

[Scott Klement <midrange-l@xxxxxxxxxxxxxxxx>]

Peter,

Why not just make it output with BLOCK(*NO)?  Why use input-add?   With 
input-add, it opens the file for reading as well as writing. 
Programmers taking a quick look at what your program does will see it as 
input as well as output, and would have to spend more time analyzing the 
code to see that it doesn't do input.

I don't understand the value of using input-add instead of BLOCK(*NO)? 
Both prevent blocking, but one announces your intent clearly and puts 
the proper type of object lock on the file, the other does not.

-SK


On 12/6/2016 2:59 PM, Peter Connell wrote:
> I always declare my file as Input with Add  instead of just output so that the compiler does not implement record blocking.
>
> ----Original Message-----
> From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Scott Klement
> Sent: Wednesday, 7 December 2016 9:40 AM
> To: Midrange Systems Technical Discussion
> Subject: Re: Records written not seen by called program
>
> Hmm...
>
> Not sure that FEOD(N) is the "best" in all cases.   If you are writing a
> bunch of records before doing the call, then I suspect FEOD(N) is the most efficient because it still uses the "buffer" for performance, it just flushes it at the right time.
>
> If you're only writing one record before calling the other program, then I'd thinking adding BLOCK(*NO) to the DCL-F (or F-spec) would be more efficient.  There's no value to record blocking if you're going to run feod after every record.  BLOCK(*NO) turns it off.
>
> At any rate, I agree not to use FRCRATIO(1), that will not perform as well.  Similarly using FEOD without the (N) will also perform worse.
>
> -SK
>
>
> On 12/6/2016 1:55 PM, Charles Wilt wrote:
> > having a unique key disables the buffering RPG does, since the DB has
> > to know about the record to enforce uniqueness; which has performance
> > implications.
> >
> > FRCRATIO(1) disables the RPG buffering along with the DB "buffering"
> > inherit to single level store by forcing a write all the way to disk;
> > which of course has even bigger performance implications.
> >
> > The "best" way to solve the issue is to use FEOD(N).
> >
> > Charles
> >
> > On Tue, Dec 6, 2016 at 12:38 PM, Roger Harman
> > <roger.harman@xxxxxxxxxxx>
> > wrote:
> >
> > > Thanks.  I considered FEOD, but may not be able to modify the caller
> > > so quickly.
> > >
> > >
> > > Still hoping to confirm the dirty record issue vs unique key.
> > >
> > >
> > > Roger Harman
> > >
> > > COMMON Certified Application Developer - ILE RPG on IBM i on Power
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > ________________________________
> > > From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxx> on behalf of
> > > Charles Wilt <charles.wilt@xxxxxxxxx>
> > > Sent: Tuesday, December 6, 2016 11:30 AM
> > > To: Midrange Systems Technical Discussion
> > > Subject: Re: Records written not seen by called program
> > >
> > > FRCRATIO(1)  is a bad old idea...
> > >
> > > Add a FEOD(N) before calling PGMB.  That will flush RPG's buffer....
> > >
> > > Charles
> > >
> > >
> > > On Tue, Dec 6, 2016 at 12:07 PM, Roger Harman
> > > <roger.harman@xxxxxxxxxxx>
> > > wrote:
> > >
> > > > I have a process that has failed a couple of times.  PgmA writes a
> > > > record and then calls PgmB with they key info.  On rare occasions,
> > > > the chain to the file from PgmB fails.
> > > >
> > > > The file in question is not unique keyed and I'm wondering if the
> > > > record is being buffered and not visible to the called program.  I
> > > > recall
> > > reading
> > > > something about that a long time ago and that the fix is to have a
> > > > unique key (LF?) over the physical file.  Is that correct?  Is
> > > > FRCRATIO(1) essentially the same thing?  It's not a high volume
> > > > process.  Maybe
> > > 12,000
> > > > records on a busy day.
> > > >
> > > > Thoughts?
> > > >
> > > > Thank you.
> > > >
> > > > Roger Harman
> > > > COMMON Certified Application Developer - ILE RPG on IBM i on Power
> > > >
> > > >
> > > >
> > > >
> > > > --
> > > > This is the Midrange Systems Technical Discussion (MIDRANGE-L)
> > > > mailing
> > > list
> > > > To post a message email: MIDRANGE-L@xxxxxxxxxxxx To subscribe,
> > > > unsubscribe, or change list options,
> > > > visit: http://lists.midrange.com/mailman/listinfo/midrange-l
> > > [http://lists.midrange.com/images/small-family.gif]<http:
> > > //lists.midrange.com/mailman/listinfo/midrange-l>
> > >
> > > MIDRANGE-L Info
> > > Page<http://lists.midrange.com/mailman/listinfo/midrange-l
> > > >
> > > lists.midrange.com
> > > To unsubscribe from MIDRANGE-L, get a password reminder, or change
> > > your subscription options enter your subscription email address:
> > >
> > >
> > >
> > > > or email: MIDRANGE-L-request@xxxxxxxxxxxx Before posting, please
> > > > take a moment to review the archives at
> > > > http://archive.midrange.com/midrange-l.
> > > midrange.com -- MIDRANGE-L mailing list archive<http://archive.
> > > midrange.com/midrange-l>
> > > archive.midrange.com
> > > midrange.com MIDRANGE-L mailing list archive
> > >
> > >
> > >
> > > > Please contact support@xxxxxxxxxxxx for any subscription related
> > > > questions.
> > > >
> > > > Help support midrange.com by shopping at amazon.com with our
> > > > affiliate
> > > > link: http://amzn.to/2dEadiD
> > > [http://g-ec2.images-amazon.com/images/G/01/social/api-
> > > share/amazon_logo_500500._V323939215_.png]<http://amzn.to/2dEadiD>
> > >
> > > Amazon.com: Online Shopping for Electronics, Apparel, Computers,
> > > Books, DVDs & more<http://amzn.to/2dEadiD> amzn.to Online shopping
> > > from the earth's biggest selection of books, magazines, music, DVDs,
> > > videos, electronics, computers, software, apparel & accessories,
> > > shoes, jewelry, tools & hardware, housewares, furniture, sporting
> > > goods, beauty & personal care, broadband & dsl, gourmet food & just
> > > about anything else.
> > >
> > >
> > >
> > > >
> > > --
> > > This is the Midrange Systems Technical Discussion (MIDRANGE-L)
> > > mailing list To post a message email: MIDRANGE-L@xxxxxxxxxxxx To
> > > subscribe, unsubscribe, or change list options,
> > > visit: http://lists.midrange.com/mailman/listinfo/midrange-l
> > > [http://lists.midrange.com/images/small-family.gif]<http:
> > > //lists.midrange.com/mailman/listinfo/midrange-l>
> > >
> > > MIDRANGE-L Info
> > > Page<http://lists.midrange.com/mailman/listinfo/midrange-l
> > > >
> > > lists.midrange.com
> > > To unsubscribe from MIDRANGE-L, get a password reminder, or change
> > > your subscription options enter your subscription email address:
> > >
> > >
> > >
> > > or email: MIDRANGE-L-request@xxxxxxxxxxxx Before posting, please take
> > > a moment to review the archives at
> > > http://archive.midrange.com/midrange-l.
> > > midrange.com -- MIDRANGE-L mailing list archive<http://archive.
> > > midrange.com/midrange-l>
> > > archive.midrange.com
> > > midrange.com MIDRANGE-L mailing list archive
> > >
> > >
> > >
> > >
> > > Please contact support@xxxxxxxxxxxx for any subscription related
> > > questions.
> > >
> > > Help support midrange.com by shopping at amazon.com with our
> > > affiliate
> > > link: http://amzn.to/2dEadiD
> > > [http://g-ec2.images-amazon.com/images/G/01/social/api-
> > > share/amazon_logo_500500._V323939215_.png]<http://amzn.to/2dEadiD>
> > >
> > > Amazon.com: Online Shopping for Electronics, Apparel, Computers,
> > > Books, DVDs & more<http://amzn.to/2dEadiD> amzn.to Online shopping
> > > from the earth's biggest selection of books, magazines, music, DVDs,
> > > videos, electronics, computers, software, apparel & accessories,
> > > shoes, jewelry, tools & hardware, housewares, furniture, sporting
> > > goods, beauty & personal care, broadband & dsl, gourmet food & just
> > > about anything else.
> > >
> > >
> > >
> > > --
> > > This is the Midrange Systems Technical Discussion (MIDRANGE-L)
> > > mailing list To post a message email: MIDRANGE-L@xxxxxxxxxxxx To
> > > subscribe, unsubscribe, or change list options,
> > > visit: http://lists.midrange.com/mailman/listinfo/midrange-l
> > > or email: MIDRANGE-L-request@xxxxxxxxxxxx Before posting, please take
> > > a moment to review the archives at
> > > http://archive.midrange.com/midrange-l.
> > >
> > > Please contact support@xxxxxxxxxxxx for any subscription related
> > > questions.
> > >
> > > Help support midrange.com by shopping at amazon.com with our
> > > affiliate
> > > link: http://amzn.to/2dEadiD
> --
> This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list To post a message email: MIDRANGE-L@xxxxxxxxxxxx To subscribe, unsubscribe, or change list options,
> visit: http://lists.midrange.com/mailman/listinfo/midrange-l
> or email: MIDRANGE-L-request@xxxxxxxxxxxx Before posting, please take a moment to review the archives at http://archive.midrange.com/midrange-l.
>
> Please contact support@xxxxxxxxxxxx for any subscription related questions.
>
> Help support midrange.com by shopping at amazon.com with our affiliate link: http://amzn.to/2dEadiD
>
>
> ##############################################################
> This correspondence is for the named person's use only. It may contain confidential or legally privileged information, or both. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this correspondence in error, please immediately delete it from your system and
> notify the sender. You must not disclose, copy or rely on any part of this correspondence if you are not the intended recipient. Any views expressed in this message are those of the individual sender, except where the sender expressly, and with authority, states them to be the views of Veda. If you need assistance, please contact Veda :-
> Australia http://www.veda.com.au/contact-us
> New Zealand http://www.veda.co.nz/contact-veda
> ##############################################################