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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.
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