Re: Newbie question about db normalization theory: redundant keys OK?
Date: Sat, 22 Dec 2007 23:31:29 -0500
Message-ID: <m3tzma3uce.fsf_at_garlic.com>
paul c <toledobythesea_at_ooyah.ac> writes:
> In those days, most Cics and some IMS programmmers knew the four
> necessary conditions for deadlock and avoided at least one of them in
> their apps. Nowadays that's considered high science. Jim Gray was a
> smart guy and I hope he's still alive but the fact remains that it
> seems that he and other concurrency experts chose to ignore the IP. I
> think Bob B said something quite profound recently, something like
> "you can't manage data without data". A corollary might be that only
> mystics can manage without data. Normalization theory started with
> the IP and caught a following, no coincidence if you ask me. The
> concurrency theorists carried on with the IMS and other physical ways
> of thinking and never seemed to get the idea that there might be a
> logical concurrency model based on the IP (at least as far as I know).
i had worked with jim back in system/r days http://www.garlic.com/~lynn/subtopic.html#systemr
when he left for tandem ... he tried to pawn off some of
the stuff on me ... a couple old email references http://www.garlic.com/~lynn/2007.html#email801006 http://www.garlic.com/~lynn/2007.html#email801016
in this post
http://www.garlic.com/~lynn/2007.html#1 "The Elements of Programming Style"
and
http://www.garlic.com/~lynn/2007d.html#email800920
in this post:
http://www.garlic.com/~lynn/2007d.html#17 Jim Gray Is Missing
later when we were doing ha/cmp
http://www.garlic.com/~lynn/subtopic.html#hacmp
and i was working on distributed lock manager and cluster scaleup ... we were working with some of the independent RDBMS vendors that also had implementations running on vax/cluster. they wanted a lock manager api that look and felt similar to what they had been using in vax/cluster, but they also had a list of several things that they felt could be done a lot better. starting from a (almost) completely clean slate ... i had a lot less baggage to worry about. Received on Sun Dec 23 2007 - 05:31:29 CET