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  3. December 2016

Re: Records written not seen by called program

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




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