Re: An RMS feature I wish for

From: Hein (hein.nomail_at_hp.nomail.com)
Date: 05/05/04 

Date: Wed, 5 May 2004 10:05:02 -0400

"Bill Todd" <billtodd@metrocast.net> wrote in message
news:Hp-dnWLPF6ZR5gXdRVn-gg@metrocast.net...
>
> "DL Phillips" <whohe@whoever.com> wrote in message
> news:af0dc2ea.0405041331.5ae2624a@posting.google.com...
> > RMS/FDL KEY definition, a way to index only records having a specific
> > matching string or value.
:
> I'm curious, and not sure I understand.
:
> but unless there are a great many of them this should not be too
burdensome

Reply collision. :-) similar thoughts, similar time, from a similiar
place.

> If some records don't want to be indexed at all, just duplicate the
> type code byte such that unindexed records can use the null key value in
the leading key byte.

My thought too, but you expressed it more clearly.
(Actually I lost a partial reply that did write it clearly. Grhhh... F*&$_*
Windows!)

> I don't know whether it was the advent of Rdb that more or less stopped
RMS development,

No, not really. RDB came more from RDBMS with new insights (Date and Codd) ,
not RMS.

- though key compression and IIRC
Yes

-single-key, no-RFA files did).
No. That one is still on my personal wish list. I'll buble it up again!

> the ability to associate arbitrary keys (potentially including multiple
instances
> in the same index) with each record
No. Allthough I might not fully understand you description.
Anyway the answer is still likely no, unless it just refers to 'segmented
keys'.
Segmented keys allow one to use the same segments (offset+length) from a
record in multiple combinations to create multiple 'overlapping' indexes,,,
but each index structures is entirely independend.

> an 'external key' mechanism rather than the current embedded-key variety,
> which among other uses and in conjunction with a no-primary-key file,
> where records were organized in a flexibly-managed bucket chain
No. Some applications build similar structures using RFA's to associate an
index file with an (optionally indexed) datafile. RMS stuck to the single
file solution.

fwiw,
Hein.

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