Monday, July 20, 2020

Oldies But Goodies: Data Independence and "Physical Denormalization"

Note: I am re-publishing some of the articles and reader exchanges from the old DBDebunk (2000-06). How well do they hold up -- have industry knowledge and practice progressed? Judge for yourself and appreciate the difference between a sound foundation and the fad-driven cookbook approach.

January 2, 2001

ML: ... one of the "4 great lies" is "I denormalize for performance." You state that normalization is a logical concept and, since performance is a physical concept, denormalization for performance reasons is impossible (i.e., it doesn't make sense). What term would you use to describe changing the physical database design to be different from the logical design to enhance performance? Because normalization is a logical concept, you imply that this is not called denormalization.

Friday, July 10, 2020

Oldies But Goodies: Skyscrapers with Shack Foundations

Ed. Note: I am re-publishing some of the posts (slightly refined) from the old dbdebunk (2000-06) to demonstrate how well they hold up to this day, and how not much has improved in the industry -- quite the opposite. The following is the first editorial with which I started dbdebunk in 2000.

June 4, 2000

“Well, it's really a judgment call and I think a lot of experience comes into it. It's a little bit like building a shack. Say you want to build a skyscraper, and you started out building a shack and you just keep trying to add onto it. After a while you have this severe structural problem ... So there is a fallacy to the build-upon-a-simple structure approach. Sometimes you get up to three stories and you have to do some major structural changes, and I just accept that.”
--Wayne Ratliffe, developer of dBase
“Client Servers were a tremendous mistake. And we are sorry that we sold it to you. Instead of applications running on the desktop and data sitting on the server, everything will be Internet based. The only things running on the desktop will be a browser and a word processor. What people want is simple, inexpensive hardware that functions as a window on to the Net. The PC was ludicrously complex with stacks of manuals, helplines and IT support needed to make it function. Client server was supposed to alleviate this problem, but it was a step in the wrong direction. We are paying through the nose to be ignorant.”
--Larry Ellison, CEO, Oracle Corp.

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