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I do believe that we do have an ISAM framework and an RDBMS over it. Any
distinctions of those 2 concepts, these 2 different levels of abstraction,
are not very important, to my way of thinking.


I wouldn't call the RLA framework ISAM, for reasons stated previously. But
I would agree that the SQE uses some form of RLA under the covers. Back in
the day some programmers optimized queries by using RLA to read records and
output rows of data to *USRIDX objects, which don't have the overhead of
databases. IBM probably does the same or something similar in the SQE.

You also made a good point about PF and LF objects being essentially
identical regardless of whether they were created with DDS or DDL.

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