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  2. RPG400-L
  3. December 2005

RE: Usage of Indexes and its Effects on an RPG Program

On Thu, 2005-12-15 at 09:36 -0600, DeLong, Eric wrote:
> But in this case, since the data has already paged into main storage, you're
> no longer seeing the effect of DASD I/O on the buffering of records....  The
> operational difference between blocked-sequential I/O and READE is that in
> READE, each record is individually fetched from storage.  If that fetch goes
> to main storage instead of DASD, it runs nearly as well as
> blocked-sequential access.....

I see your point, but there may be pages of the file already in main
storage from other processes in any case.  I doubt that there is enough
available in the box that 5000 accounts and 145000 transactions are in
main storage at the same time.  If so, it should take a lot less than
~15 seconds to run.

Regards,
Rich

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