On 2017-02-20, at 06:47, R.S. wrote:
>
> There is also a limit for PDSE member size. For PDSE v.1 it is 15 728 639
> records (approx. 1.2GB for FB 80). However since z/OS 2.1 there is v.2 of
> PDSE with limit for member at 2 146 435 071 records (approx. 171 GB for FB
> 80).
>
I believe the tokes used by NOTE and POINT represents logical
records, not blocks. So if one is processing multiple members,
the programmer should first POINT to the member, then POINT to
the record? Can one still add one to the TTRZ to POINT to the
next block (whatever a "block" means)?
> For record purposes, limits of regular PDS are: single volume, 64k TRK per
> (single) volume). Member is limited only by the size of PDS, number of
> members are limited by directory size. Huge directory provides really poor
> performance.
>
Ouch! I would hope for no worse than n log n.
https://en.wikipedia.org/wiki/Joel_Spolsky#Schlemiel_the_Painter.27s_algorithm
-- gil
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