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Introduction to Database System

Introduction to Database System
The files stored on a secondary stage device are composed of a hierarchy of data. What does a record in a file contain?

Bits
Characters
Data field
None of the listed here

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Introduction to Database System
Which command(s) is(are) used to enable/disable/drop an integrity constraint in SQL?

MODIFY TABLE
All of the listed here
ALTER TABLE
DEFINE TABLE

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Introduction to Database System
The model for a _____ resembles the hierarchical model in many respects.

Relational database
Network database
Hierarchical database
Distributed database
None of these

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Introduction to Database System
Which of the following is a database administrator's function?

backing up the database
performance monitoring
database design
All of the listed here

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Introduction to Database System
Because it contains a description of its own structure, a database is considered to be ________ .

self-describing
described
an application program
metadata compatible

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Introduction to Database System
Which type of entity represents a logical generalization whose actual occurrence is represented by a second, associated entity?

Instance entity
Subtype entity
Supertype entity
Archetype entity

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