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Sean

Dave wants a keyed, sorted LF with selection - that is a select/omit LF and is the only way to get all that in one object.

Now that object is not very well-suited to SQL. For SQL he should have both an view and an index or 2.

The view would have the selection criteria in a WHERE clause.

One index would support the view's selectivitiy. The other would do the sort. Now it might be possible to have both in one index - all the better. Depends on what those criteria are relative to the ordering.

With that, SQL can do very well. And RPG can use both a view and and index. However, there will be no builtin ordering with the view if used in an F-spec and no selectivity with the index (until 6.1) if used in an F-spec.

If he means to use the LF only in native RPG IO, then the select/omit is probably the best answer.

Later
Vern

McGovern, Sean wrote:
If you are at V5R4 and want a logical file that performs record
selection, and want to use DDL, you will need to use a view.

But what happens when you want to select records with NCSTAT with a
value other than 'D' ? You will need another view.

The best approach, IMO, is to create 1 index with both NCSTAT and
NCNPROD defined.



-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
daparnin@xxxxxxxxxxxxxx
Sent: 15 March 2010 14:37
To: Midrange Systems Technical Discussion
Subject: RE: DDL Record Select

Thanks to all for the responses. We are at V5R4 so I will probably have

to investigate the difference between an index and a view. The end
result that I want is a keyed, sorted logical file that does record selection. I'm trying to "modernize" my approach to such things but I'm still
getting up to speed. Rob mentioned the record format. I've been creating the file with the record format name and then renaming it to the real file name so the record format stays with what I want it to be. I was
thinking that the ability to specify a record format name was a V6R1 thing. As
for why we're not on V6R1, it basically hasn't bubbled up on the priority
list for those allocating the resources.



Dave Parnin

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