The on-going debate between proponents of the relational data model and proponents of the object-oriented data model (if one truly exists), resembles that between the proponents of network/hierarchic systems and relational systems a couple of decades ago. However, another system is evolving that may have a significant impact on what the database management system of the future may be and that is the Object-Relational Database Management System (ORDBMS).
What will be an ideal response?
Give your definition of an ORDBMS. Compare and contrast the ORDBMS and the Object-
Oriented Database Management System (OODBMS).
There is no one definition of an ORDBMS. The key feature is to support object-oriented features
within the confines of a relational system.
Comparison should be based around main differences – ORDBMS will probably use SQL3,
giving object-oriented features, object identity, triggers, etc., although changes will be necessary
to storage mechanisms (e.g. Quad-tree, K-D-B-tree) with resulting changes in the query optimizer.
OODBMS will probably evolve with ODMG standard, closely linked to programming language.
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Answer the following statements true (T) or false (F)
1. One negative of polymorphism is that it’s complicated, so it makes it difficult to extend systems with new capabilities. 2. A base class may have only one derived class. 3. All classes in Visual Basic have Object as either a direct or indirect base class. 4. A base class's constructors are inherited into its derived classes. 5. The first task of any base class’s constructor is to call its derived class’s constructor.
A signal mask is a set of signals a process
A. is ignoring B. is blocking
The ________ is the structure of the database - field names, data types and field properties
Fill in the blank(s) with correct word
In a one-to-many form, the main form shows data from the ________ side of the relationship
A) one B) many C) some D) every