RE: Logical Files vs. Physical Keys

["Mike Cunningham" <MCUNNING@xxxxxxx>]

I don't know if it's still a fact but 10 years ago when we set our
standards an unkeyed PF would copy 1,000 times faster than an unkeyed PF
when it came time to add a field and copy the old PF to the new. 

>>> bacollins@twitchellcorp.com 03/23/00 09:41AM >>>
The reason we only access thru logical files is if a logical file gets
damaged (which did occur when we were on V2R3) then we delete it and
recreate it. If a physical file gets damaged then the chance for data
loss
is great. An IBMer had told us at that time, it could be fixed now,
that a
program accessing the file,either IBM or User written, could corrupt
the
object. an IBMer recommended this way and we have not had any problems.
IMHO

Bruce Collins
Twitchell Corporation
bacollins@twitchellcorp.com 

"People who think they know everything really annoy those of us who
do!"

-----Original Message-----
From: owner-midrange-l@midrange.com 
[mailto:owner-midrange-l@midrange.com]On Behalf Of Bob Entwistle
Sent: Wednesday, March 22, 2000 5:16 PM
To: MIDRANGE-L@midrange.com 
Subject: Logical Files vs. Physical Keys




When we started out on the AS400 11 years ago, a decision was made to
always
use
logical files and never use physical keys (index) on all of our files. 
At
this
point, this is being reevaluated and no one seems to remember why
physical
keys
were seen as a bad thing.

Anyone able to give a short synopsis of the tradeoffs between the two? 
Any
downsides to using physical keys or indexes?

Bob





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

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