RE: Buffering and single level store (was RE: chain problem)

> -----Original Message-----
> From: rpg400-l-bounces@xxxxxxxxxxxx / DeLong, Eric
> Sent: Friday, August 13, 2004 3:09 PM
>
> Dan,
>
> Seems we've had discussions on this before... <g>

Was that *you*?  And how many other people? <g>  Honestly, I've forgotten
with whom I've had the discussions, I just know that I always come away
unconvinced.

> The S36 was a much simpler environment to work in, since the
> file system was basically just VSAM, and all files were
> contiguous within their disk volume (no fragmentation).
> That makes all file access sequential by default, and much
> easier to buffer.  OS400 and DB2 puts a lot of code between
> the app and the file system, making buffering less useful
> in some cases (such as random IO).

<Valley girl tone> W-h-a-t-e-v-e-r...  <g>

Seriously, though, it seems that this should be easy stuff for an
object-oriented, SLS system.  The OS has to know that there are records in
memory that are more current than what's on the disk.  How hard can it be?
(asks the RPG programmer).

Maybe I could get Dr. Frank to draw a comparison flowchart for me.  Short of
that, I'm just gonna wallow in yearning for the good old days.

Oh, wait, RPG-II?  Never mind.

db