Object Oriented Database(1st)

The object definition language (ODL) is which of the following?

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All of the above.
A method to implement a logical schema
Used to develop logical schemas
A data definition language for OODB

Which of the following is true concerning the following statement: class Manager extends Employee

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Manager is an abstract class and a superclass.
Manager is a concrete class and a superclass.
Manager is an abstract class and a subclass.
Manager is a concrete class and a subclass.

The Object Query Language is which of the following?

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Similar to SQL and uses a select-from-where structure
Similar to SQL and uses a select-where structure
Similar to SQL and uses a from-where structure
Not similar to SQL

An atomic literal is which of the following?

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All of the above.
Boolean
Strings
Long

The ODMG Object Model supports only unary and binary relationships.

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True
False

An extent is which of the following?

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A keyword that indicates that the subclass inherits from a superclass
The set of all instances of a class within a database
Only one instance of a class within a database
A keyword that indicates that the superclass inherits from a subclass

Which of the following is an ordered collection of elements of the same type?

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Bag
List
Dictionary
Set

A relationship should be specified how in the ODL?

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Neither direction
Both directions
One direction starting with the first class
One direction starting with the second class

An attribute's value is either a literal or an object identifier.

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True
False

The keyword "inverse" is used in which of the following?

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Relationship
All of the above
Class
Attribute

Database objects are almost always transient.

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True
False

The reserved word enum is used for which of the following?

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To define a range for a relationship.
To define a range for a class.
All of the above.
To define a range for an attribute.

Identify the class name for the following code: ABC123 course();

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All of the above
course()
course
ABC123

Literals do not have identifiers, and, therefore, cannot be individually referenced like objects.

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True
False

Using ODL, you can define which of the following?

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Structure
All of the above
Operation
Attribute

In ODL, you specify an operation using parentheses after its name.

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False
True

Using OQL, you may do which of the following?

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All of the above.
Return a specific subset of elements using a given criteria.
Return a collection of elements without duplicates.
Return an entire collection of elements including duplicates.

You may specify an object identifier with only one unique tag name.

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True
False

Which of the following is an unordered collection of elements that may contain duplicates?

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Dictionary
List
Bag
Set

The ODMG Object Model requires that a relationship be specified in both directions.

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False
True

A collection of literals or object types is called a bag.

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False
True

An attribute's value is always literal.

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False
True

Which of the following is true concerning an ODBMS?

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They are most useful for traditional, two-dimensional database table applications.
They have the ability to store complex data types on the Web.
They are overtaking RDBMS for all applications.
All of the above.

ODL supports the abstract keyword for classes and operations.

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True
False

If you know all the possible values that an attribute can have, you can enumerate those values in ODL.

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False
True

The Object Model supports different literal types, but does not support atomic literals, collection literals, and structured literals.

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True
False

Specifying a key ensures that no two objects belonging to a class have the same value for the key attribute(s).

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False
True

ODL supports which of the following types of association relationships?

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Unary and Binary and Ternary
Unary and Binary
Unary and Binary and Ternary and higher
Unary

Before specifying a key for a class, you must specify its extent.

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False
True

An ordered collection of elements of the same type are called sets.

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True
False

Object Oriented Database(1st) : Question 1 of 30