Re: Performance issue: open/read PF vs open/read SRCPF

As far as I am aware, there should be 0% performance difference.
As far as your RPG program knows, it's a physical file.  I don't think
it can tell the difference between a PF-SRC and a PF-DTA, that is
just an attribute byte that is used by programs to know how to open
the file.

That is, PDM will not allow option 2 (change) on a member of a
PF-SRC, but will allow you to a PF-DTA.  Also, PF-SRC doesn't
allow you specify the DDS for the file on creation.

Regards,

Jim Langston

Bruce Jin wrote:

>  I wonder how much difference there is (in terms of performance) when I use
> a physical file versus a source physical file. Assume I do OVRDBF, OPEN,
> READ, CLOSE in RPG. The record lengths for both PF and SRCPF are the same.
> The PF has only 1 or 2 fields in it. Both PF and SRCPF have 500 records.
>
> Thanks

+---
| This is the RPG/400 Mailing List!
| To submit a new message, send your mail to RPG400-L@midrange.com.
| To subscribe to this list send email to RPG400-L-SUB@midrange.com.
| To unsubscribe from this list send email to RPG400-L-UNSUB@midrange.com.
| Questions should be directed to the list owner/operator: david@midrange.com
+---