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  3. March 2003

Re: DB2

From: Jim Damato <jdamato@xxxxxxxxxxxxxxxxx>
> >It was not relational at the time and still isn't. The relational
> >stuff is built on top of a basic ISAM-type database allowing
> >split-key alternate indices (A.K.A. logical files).
>
> Is it not relational because it doesn't provide RDB functionality, or is it
> not relational because it was an ISAM database adapted for RDB
> functionality?
>

There is no need for a drawn-out discussion on this. When RDB first
became a buzzword everyone and his brother were claiming that his
database was an RDB. C.F. Codd, the inventor of the RDB, set forth
a set of criteria a database must meet to be relational. The AS/400
native database did not (and does not) meet these criteria. On top
of a native database one can build an RDB. AFAIK, DB/2 for MVS
is built on top of VSAM.

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