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30 abr. 2005

Razones por las que un DataWarehouse falla

Donavan McDonough , tiene una serie de interesantes razones en las que explica el por qué de que muchos entornos DataWarehouse no funcionen. Lo hace con mucho sentido, tanto lógico como del humor. No me resisto a comentar alguna de las razones que él esgrime:

Nº1: Un Datawarehouse va contra Natura:



Es una aseveración muy fuerte para empezar, ¿no? Lo que quiere decir es que en la naturaleza, los seres vivos, en general están compuestos por células, y cada célula tiene un núcleo que contiene toda la inforamción vital (el ADN).
Además, conforme va creciendo el organismo, pensemos en una oveja o planta (a la oveja la llamamos Felipa, ya esta bien de Dolly), las células se dividen y subdividen hasta formar el ser vivo completo, que además tiene estructuras diferenciadas: la cabeza, las raices, el corazón, etc...
¿Que pasa con un DataWarehouse? que no tiene 'células' con un núcleo fundamental que lo controle. Más bien son estructuras superpuestas que crecen y crecen.
Ese es el problema, en ningún lugar esta el ADN del DW, que le diga que deje de crecer, de llenarse de información redundante, de ser un monstruo en una palabra.

Tags: Teoria

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Genie and the Taliban

Three guys: a Canadian, Osama bin Laden, and Uncle Sam are out walking together one day. They come across a lantern and a genie pops out of it.
"I will give each of you each one wish. That's three wishes total," says the genie.

The Canadian says, "I'm a farmer, my dad was a farmer, and my son will also farm. I want the land to be forever fertile in Canada."

With a blink of the genie's eye, *POOF* the land in Canada was forever made fertile for farming.

Bin Laden was amazed, so he said, "I want a wall around Afghanistan, so that no infidels, Jews, or Americans can come into our precious state."

Again, with a blink of the genie's eye, *POOF* there was a huge wall around Afghanistan.

"Uncle Sam" (A former civil engineer), asks, "I'm very curious. Please tell me more about this wall."

The Genie explains, "Well, it's about 15,000 feet high, 500 feet thick, and completely surrounds the country; nothing can get in or out - it's virtually impenetrable."

Uncle Sam says, "Fill it with water."

"peachtree city" dijo...

Genie and the Taliban

Three guys: a Canadian, Osama bin Laden, and Uncle Sam are out walking together one day. They come across a lantern and a genie pops out of it.
"I will give each of you each one wish. That's three wishes total," says the genie.

The Canadian says, "I'm a farmer, my dad was a farmer, and my son will also farm. I want the land to be forever fertile in Canada."

With a blink of the genie's eye, *POOF* the land in Canada was forever made fertile for farming.

Bin Laden was amazed, so he said, "I want a wall around Afghanistan, so that no infidels, Jews, or Americans can come into our precious state."

Again, with a blink of the genie's eye, *POOF* there was a huge wall around Afghanistan.

"Uncle Sam" (A former civil engineer), asks, "I'm very curious. Please tell me more about this wall."

The Genie explains, "Well, it's about 15,000 feet high, 500 feet thick, and completely surrounds the country; nothing can get in or out - it's virtually impenetrable."

Uncle Sam says, "Fill it with water."

"mcdonough" dijo...

Genie and the Taliban

Three guys: a Canadian, Osama bin Laden, and Uncle Sam are out walking together one day. They come across a lantern and a genie pops out of it.
"I will give each of you each one wish. That's three wishes total," says the genie.

The Canadian says, "I'm a farmer, my dad was a farmer, and my son will also farm. I want the land to be forever fertile in Canada."

With a blink of the genie's eye, *POOF* the land in Canada was forever made fertile for farming.

Bin Laden was amazed, so he said, "I want a wall around Afghanistan, so that no infidels, Jews, or Americans can come into our precious state."

Again, with a blink of the genie's eye, *POOF* there was a huge wall around Afghanistan.

"Uncle Sam" (A former civil engineer), asks, "I'm very curious. Please tell me more about this wall."

The Genie explains, "Well, it's about 15,000 feet high, 500 feet thick, and completely surrounds the country; nothing can get in or out - it's virtually impenetrable."

Uncle Sam says, "Fill it with water."

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