L' Eomot Inversé (11/13/2011)
bitbucket-25253 (11/12/2011)
Without prior knowledge of the QOD author I surmised it was you...Now a general question for yourself .... in your experiences, around the world, what would you say are the percentage of DBs in 4NF and / or higher (5NF,6NF).
Well, I would guess about 50%, or maybe a bit lower, are in 4NF or higher.
actual counts from experience:
In 2007: system with 9 databases, 7 in 4NF or higher, 1 in 2NF (denormalised Management Information database), 1 not even in 1NF (arrogant and incompetent people who wouldn't follow instructions).
In 2002: system with 3 databases, 1 in BCNF and 2 not even in 1NF.
in 2000: system with 2 DBs, both in 4NF or higher.
Before 2000: most everything 4NF or higher, except MI stuff....
IMHO: I have yet to find a database that comes with any current business software that is fully normalized to 4NF in every physical data structure. After a quick rundown of what is in my current production environment many of them fail simply becuase they store duplicate denormalized historical data in the transactional database for reporting and auditing. We can talk all day long about how this could be done better, faster, stronger.
I wonder how many of us have got anyone to agree to a massive budget needed to fully normalize.
For some reason large scale business applications (like JDE and others) have many decission makers in bussiness believing that any database using under 10 gigabytes of data storage is small and running on systems way bellow Midrange.
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