Object-Oriented

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Term Paper Title	Object-Oriented
# of Words	2545
# of Pages (250 words per page double spaced)	10.18

body

Object-Oriented
Database Management
Systems

The construction of
Object-Oriented
Database Management
Systems started in the
middle 80’s, at a
prototype building level,
and at the beginning of the
90’s the first commercial
systems appeared. The
interest for the
development of such
systems stems from the
need to cover the
modeling deficiencies of
their predecessors, that is
the relational database
management systems.
They were intended to be
used by applications that
have to handle big and
complex data such as
Computer Aided
Engineering, Computer
Aided Design, and Office
Information Systems.

The area of the
OODBMSs is
characterized by three
things. First, it lacks a
common data model.
There is no common data
model although many
proposals can be found in
the literature. This is a
more general problem of
all the object-oriented
systems not only the
database management
systems. Since the data
model determines the
database language of the
system, which in turn
determines the
implementation of the
system, we can
understand that the
differences between the
various systems with
different data models can
be big and substantial.
Second is the common
theoretical framework.
Although there is no
standard object-oriented
model, most
object-oriented database
systems that are
operational or under
development today share
a set of fundamental
object-oriented concepts.
Therefore the
implementation issues in
OODBMSs that arise due
to these concepts are
universal. The third
characteristic is that of
experimental activity.
Plenty of prototypes have
been implemented and
some !

of them became
commercial products.
There is really a need for
applications to handle very
complex data and that is
why the interest of people
in building such systems is
so strong.

Although there is no
consensus on what an
OODBMS is and which
are the features that
differentiate it from other
systems, there has been a
lot of effort for an
agreement on defining the
formal characteristics that
can stand as the set of
specification requirements
for the construction of
such a system. These
should also be used as the
set of features that one has
to check in order to find
out if a system is really an
OODBMS. The features
of the OODBMS can be
divided as follows:

* mandatory features:
these are the features that
one system should have in
order to deserve the title
OODBMS.

* optional features: these
are the features that if one
system has, should be
considered better than
another that does not have
...

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