Re: DBA Question

["Paul Tuohy" <tuohyp@xxxxxxxxxxxxx>]

Hi Jack,

Others have highlighted quite a few of the similarities/differences. My own
view (pardon the pun) is that it depends on how you intend to use them.

If you are talking about developing a DB that will be accessed primarily by
SQL from many different sources, then Views and Indexes. If it is primarily
for RPG, then views, indexes and logical files.

At its simplest, an index is a keyed logical and a view is a non keyed
logical. From an RPG angle the problem is with the views - even they are a
lot more powerful then DDS created logicals they are of little use in RPG
since they do not have a key - so only useful if using embedded SQL.

FWIW, I did an article on comparing DDS and SQL's DDL on search400 at
http://search400.techtarget.com/tip/1,289483,sid3_gci1021854,00.html?FromTax
onomy=%2Fpr%2F2f9

HTH

Paul Tuohy

----- Original Message -----
From: "Jack Derham" <derhamj@xxxxxxxxxxxxx>
To: "'Midrange Systems Technical Discussion'" <midrange-l@xxxxxxxxxxxx>
Sent: Saturday, June 18, 2005 3:40 AM
Subject: DBA Question


> To the List,
>
>
>
> Got into a discussion this afternoon about what the real differences are
> between logical files, views and indexes. The discussion got a little
heated
> at times so I would ask that some of you well versed members to please
help
> out less fortunate uninformed members about the real physical and logical
> attributes of these object types.
>
>
>
> Jack Derham
>
> Direct Systems, Inc.
>
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