13202902
Beschreibung
Quiz von jacob thomas, aktualisiert more than 1 year ago
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Erstellt von jacob thomas
vor mehr als 6 Jahre
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Frage 1
Frage
The entity integrity rule requires that ____.
Antworten
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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
Frage 2
Frage
The referential integrity rule requires that ____.
Antworten
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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
Frage 3
Frage
The extended entity relationship model (EERM) is sometimes referred to as the ____.
Antworten
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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
Frage 4
Frage
The ____ depicts the arrangement of higher-level entity supertypes (parent entities) and lower-level entity subtypes (child entities).
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subtype discriminator
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inheritance
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specialization hierarchy
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entity supertype
Frage 5
Frage
Every subtype can have ____ supertype to which it is directly related.
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none
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only one
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one or many
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many
Frage 6
Frage
A specialization hierarchy can have ____ levels of supertype/subtype relationships.
Antworten
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none
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only one
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one or many
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many
Frage 7
Frage
The property of ____ enables an entity subtype to inherit the attributes and relationships of the supertype.
Antworten
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subtype discriminator
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inheritance
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specialization hierarchy
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entity supertype
Frage 8
Frage
One important inheritance characteristic is that all entity subtypes inherit their ____ attribute from their supertype.
Antworten
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primary key
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natural key
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foreign key
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Surrogate key
Frage 9
Frage
What feature is a DDBMS disadvantage?
Antworten
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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
Frage 10
Frage
What feature is a DDBMS advantage?
Antworten
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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
Frage 11
Frage
A database is composed of several parts known as database ____.
Antworten
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sections
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fragments
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partitions
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parts
Frage 12
Frage
Under the ____ scenario, multiple processes run on different computers sharing a single data repository.
Antworten
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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
Frage 13
Frage
The ____ scenario describes a fully distributed DBMS with support for multiple data processors and transaction processors at multiple sites.
Antworten
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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
Frage 14
Frage
____ distributed database systems integrate only one type of centralized DBMS over a network.
Antworten
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Homogeneous
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Heterogeneous
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Fully heterogeneous
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Fully homogeneous
Frage 15
Frage
____ transparency allows the integration of several different local DBMSs under a common, or global, schema.
Antworten
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Transaction
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Performance
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Distribution
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Heterogeneity
Frage 16
Frage
The ____ contains the description of the entire database as seen by the database administrator.
Antworten
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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
Frage 17
Frage
___ fragmentation allows us to break a single object into two or more segments or fragments.
Antworten
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Horizontal
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Vertical
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Data
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Mixed
Frage 18
Frage
With ____ data allocation, the database is divided into several disjointed parts and stored at several sites.
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centralized
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decentralized
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partitioned
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replicated
Frage 19
Frage
The ____ rule requires that all copies of data fragments be identical.
Antworten
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shared fragment
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mutual consistency
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horizontal fragmentation
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replication
Frage 20
Frage
Which of the following is a problem with a centralized database?
Antworten
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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
Frage 21
Frage
The components of a data warehouse are ____.
Antworten
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integrated
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volatile
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object-oriented
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decentralized
Frage 22
Frage
Which of the following is a rule that defines the data warehouse?
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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
Frage 23
Frage
Which of the following is a characteristic of an OLAP?
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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
Frage 24
Frage
____ data must conform to uniform structures and formats to avoid data conflicts.
Antworten
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Data mart
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Database
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Data warehouse
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Data analysis
Frage 25
Frage
Multidimensional data analysis refers to the processing of data such that data are viewed as part of the ____ structure.
Antworten
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semidimensional
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multidimensional
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one-dimensional
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two-dimensional
Frage 26
Frage
MOLAP extends OLAP functionality to multidimensional ____ management systems.
Antworten
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online
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database
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processing
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data
Frage 27
Frage
MOLAP's premise is that ___ databases are best suited to manage, store, and analyze multidimensional data.
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multidimensional
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one-dimensional
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two-dimensional
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relational.
Frage 28
Frage
The ___ hierarchy provides a top-down data organization that is used for two main purposes: aggregation and drill-down/roll-up data analysis.
Antworten
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relational
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dimensional
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multidimensional
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attribute
Frage 29
Frage
During the data ___ phase of data mining, common characteristics or patterns are identified.
Antworten
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analysis
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preparation
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extraction
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acquisition
Frage 30
Frage
During the ___ phase of data mining, the data-mining findings are used to predict future behavior and forecast business outcomes.
Antworten
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analysis and classifications
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preparation
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prognosis
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knowledge acquisition
Frage 31
Frage
The __ schema creates the near equivalent of a multidimensional database schema from the existing relational database.
Antworten
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star
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square
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OLAP
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ROLAP
Frage 32
Frage
___ backups take place while the user is working on the database.
Antworten
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Full
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Incremental
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Concurrent
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Sequential
Frage 33
Frage
A ___ is named collection of database access privileges that authorize a user to connect to the database and use the database system resources.
Antworten
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user
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role
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profile
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manager
Frage 34
Frage
At the level of top management the database must be able to ___.
Antworten
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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
Frage 35
Frage
As a manager, the DBA must concentrate on the ____ dimensions of the database administration function.
Antworten
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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
Frage 36
Frage
User-access management is a subset of ____.
Antworten
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password protection
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authorization management
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data integrity
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managerial control
Frage 37
Frage
Classifying users into ____, according to common access needs, facilitates the DBA’s job of controlling and managing the access privileges of individual users.
Antworten
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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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