13833523
Description
Quiz by Brandon Gagon, updated more than 1 year ago
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Created by Brandon Gagon
almost 6 years ago
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Question 1
Question
The entity integrity rule requires that ____.
Answer
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all primary key entries are unique
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a part of the key may be null
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foreign key values do not reference primary key values
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duplicate object values are allowed
Question 2
Question
The referential integrity rule requires that ____.
Answer
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every null foreign key value must reference an existing primary key value
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an attribute have a corresponding value
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every non-null foreign key value reference an existing primary key value
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you delete a row in one table whose primary key does not have a matching foreign key value in another table
Question 3
Question
The ____ depicts the arrangement of higher-level entity supertypes (parent entities) and lower-level entity subtypes (child entities).
Answer
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subtype discriminator
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inheritance
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specialization hierarchy
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entity supertype
Question 4
Question
Every subtype can have ____ supertype to which it is directly related.
Answer
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none
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only one
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one or many
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many
Question 5
Question
Every subtype can have ____ supertype to which it is directly related.
Answer
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none
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only one
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one or many
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many
Question 6
Question
A specialization hierarchy can have ____ levels of supertype/subtype relationships.
Answer
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none
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only one
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one or many
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many
Question 7
Question
The property of ____ enables an entity subtype to inherit the attributes and relationships of the supertype.
Answer
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subtype discriminator
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inheritance
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specialization hierarchy
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entity supertype
Question 8
Question
One important inheritance characteristic is that all entity subtypes inherit their ____ attribute from their supertype.
Answer
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primary key
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natural key
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foreign key
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surrogate key
Question 9
Question
What feature is a DDBMS disadvantage?
Answer
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Processor independence
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User-friendly interface
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Security
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Faster data access
Question 10
Question
What feature is a DDBMS advantage?
Answer
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Reduced operating cost
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Complexity of management and control
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Increased storage requirements
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Increased training cost
Question 11
Question
A database is composed of several parts known as database ____.
Answer
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sections
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fragments
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partitions
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parts
Question 12
Question
Under the ____ scenario, multiple processes run on different computers sharing a single data repository.
Answer
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Homogeneous
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a
Question 13
Question
The ____ scenario describes a fully distributed DBMS with support for multiple data processors and transaction processors at multiple sites.
Answer
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a
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b
Question 14
Question
____ distributed database systems integrate only one type of centralized DBMS over a network.
Answer
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Homogenous
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Heterogeneous
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Fully heterogeneous
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Fully homogeneous
Question 15
Question
____ transparency allows the integration of several different local DBMSs under a common, or global, schema.
Answer
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Transaction
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Performance
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Distribution
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Heterogeneity
Question 16
Question
The ____ contains the description of the entire database as seen by the database administrator.
Answer
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distributed global dictionary
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distributed data dictionary
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distributed global schema
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distributed data schema
Question 17
Question
____ fragmentation allows us to break a single object into two or more segments or fragments.
Answer
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Horizontal
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Vertical
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Data
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Mixed
Question 18
Question
With ____ data allocation, the database is divided into several disjointed parts and stored at several sites.
Answer
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centrialized
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decentralized
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partitioned
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replicated
Question 19
Question
The ____ rule requires that all copies of data fragments be identical.
Answer
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shared fragment
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mutual consistency
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horizontal fragmentation
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replication
Question 20
Question
Which of the following is a problem with a centralized database?
Answer
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high cost
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Good performance from remote locations
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Poor performance from the main location
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Lack of storage
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