Re: [RE: Programming philosophy Was:RPG IV program - comments request ed]

[Frank Kolmann <fkolmann@xxxxxxxxxxxx>]

Buck Calabro <mcalabro@commsoft.net> wrote:
> Absolutely!  Excellent suggestion, although not all 400's have the SQL
> development kit.
> 
> Although SQL is itself a welcome abstraction from the physical file layout,
> putting the SQL inside an "update" procedure, will allow you to quickly
> change from "native" to SQL without impacting the calling code.  Using
> procedures can let you experiment with the various trade-offs (run time
cost

A problem with SQL is that one can access the data in whatever sequence one
pleases without any reference to database performance. Sure IBM has a SQL
optimiser that hunts for indexes that the SQL statement can use, but if the
coders are allowed to freely code SQL constructs without regard to the indexes
that are needed to support the SQL you can end up with a nightmare. (and them
some as I am experiencing )

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