13833523
Descrição
Quiz por Brandon Gagon, atualizado more than 1 year ago
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Criado por Brandon Gagon
quase 6 anos atrás
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Questão 1
Questão
The entity integrity rule requires that ____.
Responda
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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
Questão 2
Questão
The referential integrity rule requires that ____.
Responda
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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
Questão 3
Questão
The ____ depicts the arrangement of higher-level entity supertypes (parent entities) and lower-level entity subtypes (child entities).
Responda
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subtype discriminator
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inheritance
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specialization hierarchy
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entity supertype
Questão 4
Questão
Every subtype can have ____ supertype to which it is directly related.
Responda
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none
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only one
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one or many
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many
Questão 5
Questão
Every subtype can have ____ supertype to which it is directly related.
Responda
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none
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only one
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one or many
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many
Questão 6
Questão
A specialization hierarchy can have ____ levels of supertype/subtype relationships.
Responda
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none
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only one
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one or many
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many
Questão 7
Questão
The property of ____ enables an entity subtype to inherit the attributes and relationships of the supertype.
Responda
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subtype discriminator
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inheritance
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specialization hierarchy
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entity supertype
Questão 8
Questão
One important inheritance characteristic is that all entity subtypes inherit their ____ attribute from their supertype.
Responda
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primary key
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natural key
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foreign key
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surrogate key
Questão 9
Questão
What feature is a DDBMS disadvantage?
Responda
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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
Questão 10
Questão
What feature is a DDBMS advantage?
Responda
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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
Questão 11
Questão
A database is composed of several parts known as database ____.
Responda
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sections
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fragments
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partitions
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parts
Questão 12
Questão
Under the ____ scenario, multiple processes run on different computers sharing a single data repository.
Responda
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Homogeneous
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a
Questão 13
Questão
The ____ scenario describes a fully distributed DBMS with support for multiple data processors and transaction processors at multiple sites.
Responda
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a
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b
Questão 14
Questão
____ distributed database systems integrate only one type of centralized DBMS over a network.
Responda
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Homogenous
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Heterogeneous
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Fully heterogeneous
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Fully homogeneous
Questão 15
Questão
____ transparency allows the integration of several different local DBMSs under a common, or global, schema.
Responda
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Transaction
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Performance
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Distribution
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Heterogeneity
Questão 16
Questão
The ____ contains the description of the entire database as seen by the database administrator.
Responda
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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
Questão 17
Questão
____ fragmentation allows us to break a single object into two or more segments or fragments.
Responda
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Horizontal
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Vertical
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Data
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Mixed
Questão 18
Questão
With ____ data allocation, the database is divided into several disjointed parts and stored at several sites.
Responda
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centrialized
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decentralized
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partitioned
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replicated
Questão 19
Questão
The ____ rule requires that all copies of data fragments be identical.
Responda
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shared fragment
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mutual consistency
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horizontal fragmentation
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replication
Questão 20
Questão
Which of the following is a problem with a centralized database?
Responda
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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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