Re: two types of logical -- MIDRANGE-L

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Subject: Re: two types of logical
From: "James H. H. Lampert" <jamesl@xxxxxxxxxxx>
Date: Wed, 22 Jun 2005 23:43:46 -0700
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Dwayne Allison wrote:
>What are the two types of logical?

Actually, there are three:

1. Simple (a single based-on physical)

2. Multi-format (two or more based-on physicals, with separate record
formats in a common key sequence)

3. Joined (a single composite record format tying together related
records from two or more based-on physicals)

And that's not counting whatever types of logical files are unique to SQL.

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