×
The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.
On Sunday, February 29, 2004, at 11:57 AM, M. Lazarus wrote:
Are you referring to the OVRDBF NBRRCDS() keyword for double
buffering? I thought that double buffering in RPG only worked for
PRINTER files and that it didn't really work anymore.
Yes. NBRRCDS controls blocking from DASD into main storage.
SEQONLY(*YES nnn) controls blocking from main storage into the program
buffer. Blocking used to work only for sequential processing because
you couldn't block records for files defined as keyed in the program.
As soon as you put a K on the F-spec program buffer blocking was
disabled. BLOCK(*YES) changes that behaviour and blocks both sequential
and keyed files but this happens after records are brought from DASD to
main storage.
I'm not sure if BLOCK(*YES) affects blocking into main storage or only
program buffer blocking. I suspect the latter. Barbara or Hans could
confirm this.
NBRRCDS is useful only when the records on DASD are physically in the
sequence they are processed so using NBRRCDS in conjunction with
BLOCK(*YES) will help only for files processed sequentially or
sequentially by key.
NBRRCDS should not be used for files where the physical order of the
records is not the same as the order in which they will be processed
because that will cause additional, possibly unwanted, records to be
brought into main storage.
A better way to improve performance for this sort of random processing
is to use SETOBJACC to load the file into a dedicated storage pool.
Regards,
Simon Coulter.
--------------------------------------------------------------------
FlyByNight Software AS/400 Technical Specialists
http://www.flybynight.com.au/
Phone: +61 3 9419 0175 Mobile: +61 0411 091 400 /"\
Fax: +61 3 9419 0175 \ /
X
ASCII Ribbon campaign against HTML E-Mail / \
--------------------------------------------------------------------
As an Amazon Associate we earn from qualifying purchases.
This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact
[javascript protected email address].
Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.