24002601
Descripción
Test por Craig Willey, actualizado hace más de 1 año
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Creado por Craig Willey
hace más de 4 años
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Pregunta 1
Pregunta
The entity integrity rule requires that ____.
Respuesta
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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
Pregunta 2
Pregunta
The referential integrity rule requires that ____.
Respuesta
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every null foreign key value must refer-ence 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
Pregunta 3
Pregunta
The extended entity relationship model (EERM) is sometimes referred to as the ____.
Respuesta
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entity relationship model
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enhanced entity relationship model
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entity clustering relationship model
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extended entity relationship diagram
Pregunta 4
Pregunta
The ____ depicts the arrangement of higher-level entity supertypes (parent entities) and lower-level entity subtypes (child entities).
Respuesta
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subtype discriminator
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inheritance
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specialization hierarchy
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entity supertype
Pregunta 5
Pregunta
Every subtype can have ____ supertype to which it is directly related.
Respuesta
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none
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only one
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one or many
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many
Pregunta 6
Pregunta
A specialization hierarchy can have ____ levels of supertype/subtype relationships.
Respuesta
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none
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only one
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one or many
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many
Pregunta 7
Pregunta
The property of ____ enables an entity subtype to inherit the attributes and relationships of the su-pertype.
Respuesta
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subtype discriminator
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inheritance
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specialization hierarchy
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entity supertype
Pregunta 8
Pregunta
One important inheritance characteristic is that all entity subtypes inherit their ____ attribute from their supertype.
Respuesta
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primary key
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natural key
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foreign key
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Surrogate key
Pregunta 9
Pregunta
What feature is a DDBMS disadvantage?
Respuesta
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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
Pregunta 10
Pregunta
What feature is a DDBMS advantage?
Respuesta
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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
Pregunta 11
Pregunta
A database is composed of several parts known as database ____.
Respuesta
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sections
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fragments
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partitions
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parts
Pregunta 12
Pregunta
Under the ____ scenario, multiple processes run on different computers sharing a single data repository.
Respuesta
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single-site processing, single-site data
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multiple-site processing, single-site data
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single-site processing, multiple-site data
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multiple-site processing, multiple-site data
Pregunta 13
Pregunta
The ____ scenario describes a fully distributed DBMS with support for multiple data processors and transaction processors at multiple sites.
Respuesta
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multiple-site processing, single-site data
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single-site processing, multiple-site data
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single-site processing, single-site data
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multiple-site processing, multiple-site data
Pregunta 14
Pregunta
____ distributed database systems integrate only one type of centralized DBMS over a network.
Respuesta
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Homogeneous
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Heterogeneous
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Fully heterogeneous
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Fully homogeneous
Pregunta 15
Pregunta
____ transparency allows the integration of several different local DBMSs under a common, or global, schema.
Respuesta
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Transaction
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Performance
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Distribution
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Heterogeneity
Pregunta 16
Pregunta
The ____ contains the description of the entire database as seen by the database administrator.
Respuesta
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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
Pregunta 17
Pregunta
____ fragmentation allows us to break a single object into two or more segments or fragments.
Respuesta
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Horizontal
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Vertical
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Data
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Mixed
Pregunta 18
Pregunta
With ____ data allocation, the database is divided into several disjointed parts and stored at sev-eral sites.
Respuesta
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centralized
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decentralized
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partitioned
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replicated
Pregunta 19
Pregunta
The ____ rule requires that all copies of data fragments be identical.
Respuesta
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shared fragment
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mutual consistency
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horizontal fragmentation
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replication
Pregunta 20
Pregunta
Which of the following is a problem with a centralized database?
Respuesta
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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
Pregunta 21
Pregunta
The components of a data warehouse are ____.
Respuesta
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integrated
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volatile
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object-oriented
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decentralized
Pregunta 22
Pregunta
Which of the following is a rule that defines the data warehouse?
Respuesta
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Environments are integrated
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Data warehouse contains historical data over a long time horizon
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Data are object-oriented
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Data are subject-oriented
Pregunta 23
Pregunta
Which of the following is a characteristic of an OLAP?
Respuesta
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Uses single dimensional data analysis techniques
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Provides introductory database support and complex end user interfaces
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Provides introductory end-user interfaces
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Supports client/server architecture
Pregunta 24
Pregunta
____ data must conform to uniform structures and formats to avoid data conflicts.
Respuesta
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Data mart
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Database
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Data warehouse
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Data analysis
Pregunta 25
Pregunta
Multidimensional data analysis refers to the processing of data such that data are viewed as part of the ____ structure.
Respuesta
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semidimensional
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multidimensional
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one-dimensional
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two-dimensional
Pregunta 26
Pregunta
MOLAP extends OLAP functionality to multidimensional ____ management systems.
Respuesta
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online
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database
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processing
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data
Pregunta 27
Pregunta
MOLAP's premise is that ____ databases are best suited to manage, store, and analyze multi-dimensional data.
Respuesta
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multidimensional
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one-dimensional
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two-dimensional
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relational
Pregunta 28
Pregunta
The ____ hierarchy provides a top-down data organization that is used for two main purposes: aggregation and drill-down/roll-up data analysis.
Respuesta
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relational
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dimensional
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multidimensional
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attribute
Pregunta 29
Pregunta
During the data ____ phase of data mining, common characteristics or patterns are identified.
Respuesta
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analysis
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preparation
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extraction
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acquisition
Pregunta 30
Pregunta
During the ____ phase of data mining, the data-mining findings are used to predict future behav-ior and forecast business outcomes.
Respuesta
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analysis and classification
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preparation
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prognosis
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knowledge acquisition
Pregunta 31
Pregunta
The ____ schema creates the near equivalent of a multidimensional database schema from the existing relational database.
Respuesta
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star
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square
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OLAP
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ROLAP
Pregunta 32
Pregunta
____ backups take place while the user is working on the database.
Respuesta
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Full
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Incremental
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Concurrent
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Sequential
Pregunta 33
Pregunta
A ____ is a named collection of database access privileges that authorize a user to connect to the database and use the database system resources.
Respuesta
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user
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role
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profile
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manager
Pregunta 34
Pregunta
At the level of top management, the database must be able to ____.
Respuesta
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represent and support the company operations as closely as possible
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deliver the data necessary for tactical decisions and planning
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produce query results within specified performance levels
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provide access to external and internal data to identify growth opportunities and to chart the direction of such growth
Pregunta 35
Pregunta
As a manager, the DBA must concentrate on the ____ dimensions of the database administration function.
Respuesta
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control and planning
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conflict and problem resolution
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policies and standards
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security and privacy
Pregunta 36
Pregunta
User-access management is a subset of ____.
Respuesta
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password protection
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authorization management
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data integrity
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managerial control
Pregunta 37
Pregunta
Classifying users into ____, according to common access needs, facilitates the DBA’s job of controlling and managing the access privileges of individual users.
Respuesta
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user groups
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sections
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authorization schemes
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policy definitions
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