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Thanks Mark, for the much better explanation. I tried but I suck at communication, that's why I work for a telco. :-)
Duane Christen
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Mark S. Waterbury
Sent: Friday, December 03, 2010 11:19 AM
To: RPG programming on the IBM i / System i
Subject: Re: FILE TRIGGER
Ken:
In i5/OS or OS/400, you can always issue an OVRDBF at runtime, to
specify "blocking" or to change the "blocking factor" using the SEQONLY
parameter on the OVRDBF command, without ever having to change or
recompile your programs.
Write a small RPG/400 program that writes records to a file and compile
with CRTRPGPGM ... GENOPT((*LIST) and study the generated OPM MI
assembler language instructions in the listing spool file to see the
code that is generated for the I/O. There is no code generated in the
program to do "blocking", and so, all blocking must be done by the
system, within the database I/O routines that are called from the
generated code.
Hope that helps,
Mark S. Waterbury
On 12/3/2010 10:51 AM, Ken Sims wrote:
Sorry Duane, but no, that does NOT make sense. When a file is
blocked, the program holds the records in its own storage and does not
call database management until it is ready to write the block to the
file.
(This is all irrespective of when records are actually written to some
type of permanant media.)
midrange.com
