An example of my situation is that I have an order file, say with an
orderId and orderDate field.
I may receive 50 million orders a year, and I want to be able to check
whether I have previously received the same order within the last year.
I know I can just create a logical on orderId and check, but just wanted
to know if there was a way of sub setting my file by for instance
current ytd, and then checking for my orderId.
Kind rgds
Luke
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Anderson, Kurt
Sent: 11 April 2013 15:48
To: RPG programming on the IBM i (AS/400 and iSeries)
Subject: RE: Logical file in RPG
Create a new index?
I don't understand this line of thinking. If I was concerned about all
the different fields we may want to access a file by I'd never get any
indexes created - or they'd end up convoluted and inefficient. Is it
that any new index would want to also select only a subset of records?
If so, then each new index may need a new view (as Gene gave an example
of) if you want the database to be the one supplying a subset of data
(instead of needing programs to do it).
I guess if you provided an example of a possible situation you're
concerned about, I (and possibly we) could better visualize your
concern.
-Kurt
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Klugman, Luke
Sent: Thursday, April 11, 2013 9:19 AM
To: RPG programming on the IBM i (AS/400 and iSeries)
Subject: RE: Logical file in RPG
Thanks for this Gene, but what if I have an additional field I want to
use as the key, instead of the date...
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Gene Burns
Sent: 11 April 2013 14:36
To: RPG programming on the IBM i / System i
Subject: Re: Logical file in RPG
You could create the index over the table using the date then create a
view over the table with the date selection. If I recall correctly the
view would utilize the index to select the correct data.
CREATE INDEX ATABLEI1 ON ATABLE (DATE_FIELD)
CREATE VIEW ATABLEV1 ON ATABLE
WHERE DATE_FIELD >= (CURRENT DATE - 1 YEARS)
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