Object-Oriented DBMS
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Figure 11.34
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Table 11.4 The Thirteen OODBMS Rules
How OO Affects Database Design
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 OO database design approach provides both the data
identification and the procedures or data
manipulation to be performed.
 OO database design forces us to think of data and
procedures as a self-contained entity.
 OO design is iterative and incremental in nature.
 DBA’s role is likely to change with more
programming responsibilities.
 Lack of standards affects OO database design.
OODBMS: Advantages and
Disadvantages
 Advantages
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
More semantic information.

Support for complex objects.

Extensibility of data types.

Improved performance with efficient caching.

Versioning.

Faster development and easy maintenance through
inheritance and reusability.

Technology-driven product for next generation DBMS.

Potential to integrate DBMSs into a single environment.
OODBMS: Advantages and
Disadvantages
 Disadvantages
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
Strong opposition from the established players.

Lack of theoretical foundation.

Retrogressive to the old pointer systems.

Lack of standard ad hoc query language.

Lack of business data design and management tools.

Steep learning curve.

Lack of resources.
How OO Concepts Have Influenced the
Relational Model
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 New Features for Extended Relational
(Object/Relational) Model

Extensibility of new user-defined (abstract) data
types

Complex objects

Inheritance

Procedure calls (rules or triggers)

System-generated identifiers (OID surrogates)
How OO Concepts Have Influenced the
Relational Model
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 Philosophy that guides the relational model’s
enhancements:

Semantic and object-oriented concepts are
necessary to support the new generation of
applications.

These concepts can and must be added to the
relational model.

The benefits of the relational model must be
preserved to protect the investment in relational
technology and to provide downward compatibility.
The Next Generation of DBMS
 The next generation of DBMS is likely to
incorporate features borrowed from:
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
Object-oriented database systems

Artificial intelligence systems

Expert systems

Distributed database

The Internet