18 Feb
2021
18 Feb
'21
5:58 a.m.
On Wed, Feb 17, 2021 at 5:16 AM John Gilmore <gnu(a)toad.com> wrote:
Grant Taylor via TUHS <tuhs(a)minnie.tuhs.org>
wrote:
It seems that Andrew has addressed Daytona, but there was a small database
package called `pq` that shipped with plan9 at one point that I believe
started life on Unix. It was based on "flat" text files as the underlying
data source, and one would describe relations internally using some
mechanism (almost certainly another special file). An interesting feature
was that it was "implicitly relational": you specified the data you wanted
and it constructed and executed a query internally: no need to "JOIN"
tables on attributes and so forth. I believe it supported indices that were
created via a special command. I think it was used as the data source for
the AT&T internal "POST" system. A big downside was that you could not add
records to the database in real time.
It was taken to Cibernet Inc (they did billing reconciliation for wireless
carriers. That is, you have an AT&T phone but make a call that's picked up
by T-Mobile's tower: T-Mobile lets you make the call but AT&T has to pay
them for the service. I contracted for them for a short time when I got out
of the Marine Corps---the first time) and enhanced and renamed "Eteron" and
the record append issue was, I believe, solved. Sadly, I think that
technology was lost when Cibernet was acquired. It was kind of cool.
- Dan C.
I don't know where the line is to transition
from stock text files and
an actual DB. I naively suspect that by the time you need an index, you
should have transitioned to a DB.
Didn't AT&T Research at some point write a database, called Daytona,
that worked like ordinary Unix commands? E.g. it just sat there in disk
files when you weren't using it. There was no "database server". When
you wanted to do some operation on it, you ran a command, which read the
database and did what you wanted and wrote out results and stopped and
returned to the shell prompt. How novel!
Supposedly it had high performance on large collections of data,
with millions or billions of records. Things like telephone billing
data.
I found a couple of conference papers about it, but never saw specs for
it, not even man pages. How did Daytona fit into Unix history? Was
it ever part of a Unix release?