One further thought. What is complexity? Is it something that can
accurately be measured by the number of nodes in an ER diagram, or is
there more to it than that?
===
Gregory Woodhouse
[EMAIL PROTECTED]
"It is a capital mistake to theorize before one has data."
--Sir Arthur Conan Doyle
On Jun 11, 2005, at 7:51 PM, Chris Richardson wrote:
Want an idea of the complexity of the VistA model? Look up the
Entity
Relationship Diagrams. Then show one of the nearly 100 pdf files
to your
favorite Relational Database Guru and watch him blanch at the
numbers of
data elements and relationships represented there. On CHCS there
were over
22,000 different data elements in the data dictionary. In Northern
California, nearly 500,000 patient records are stored in less than 120
gigabytes of disk space. It would be interesting to see how much
space the
same information would take up in the relational model, then pack a
lunch,
cause it will take a good long time to traverse that data as a
relational
database.
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