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C192 DataStorage / DML / Data Architectures

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College C192 Databases Quiz sobre C192 DataStorage / DML / Data Architectures, criado por Craig Willey em 29-06-2020.
Craig Willey
Quiz por Craig Willey, atualizado more than 1 year ago
Craig Willey
Criado por Craig Willey mais de 4 anos atrás
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Resumo de Recurso

Questão 1

Questão
The entity integrity rule requires that ____.
Responda
  • all primary key entries are unique
  • a part of the key may be null
  • foreign key values do not reference primary key values
  • duplicate object values are allowed

Questão 2

Questão
The referential integrity rule requires that ____.
Responda
  • every null foreign key value must refer-ence an existing primary key value
  • an attribute have a corresponding value
  • every non-null foreign key value reference an existing primary key value
  • 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 extended entity relationship model (EERM) is sometimes referred to as the ____.
Responda
  • entity relationship model
  • enhanced entity relationship model
  • entity clustering relationship model
  • extended entity relationship diagram

Questão 4

Questão
The ____ depicts the arrangement of higher-level entity supertypes (parent entities) and lower-level entity subtypes (child entities).
Responda
  • subtype discriminator
  • inheritance
  • specialization hierarchy
  • entity supertype

Questão 5

Questão
Every subtype can have ____ supertype to which it is directly related.
Responda
  • none
  • only one
  • one or many
  • many

Questão 6

Questão
A specialization hierarchy can have ____ levels of supertype/subtype relationships.
Responda
  • none
  • only one
  • one or many
  • many

Questão 7

Questão
The property of ____ enables an entity subtype to inherit the attributes and relationships of the su-pertype.
Responda
  • subtype discriminator
  • inheritance
  • specialization hierarchy
  • entity supertype

Questão 8

Questão
One important inheritance characteristic is that all entity subtypes inherit their ____ attribute from their supertype.
Responda
  • primary key
  • natural key
  • foreign key
  • Surrogate key

Questão 9

Questão
What feature is a DDBMS disadvantage?
Responda
  • Processor independence
  • User-friendly interface
  • Security
  • Faster data access

Questão 10

Questão
What feature is a DDBMS advantage?
Responda
  • Reduced operating cost
  • Complexity of management and control
  • Increased storage requirements
  • Increased training cost

Questão 11

Questão
A database is composed of several parts known as database ____.
Responda
  • sections
  • fragments
  • partitions
  • parts

Questão 12

Questão
Under the ____ scenario, multiple processes run on different computers sharing a single data repository.
Responda
  • single-site processing, single-site data
  • multiple-site processing, single-site data
  • single-site processing, multiple-site data
  • multiple-site processing, multiple-site data

Questão 13

Questão
The ____ scenario describes a fully distributed DBMS with support for multiple data processors and transaction processors at multiple sites.
Responda
  • multiple-site processing, single-site data
  • single-site processing, multiple-site data
  • single-site processing, single-site data
  • multiple-site processing, multiple-site data

Questão 14

Questão
____ distributed database systems integrate only one type of centralized DBMS over a network.
Responda
  • Homogeneous
  • Heterogeneous
  • Fully heterogeneous
  • Fully homogeneous

Questão 15

Questão
____ transparency allows the integration of several different local DBMSs under a common, or global, schema.
Responda
  • Transaction
  • Performance
  • Distribution
  • Heterogeneity

Questão 16

Questão
The ____ contains the description of the entire database as seen by the database administrator.
Responda
  • distributed global dictionary
  • distributed data dictionary
  • distributed global schema
  • distributed data schema

Questão 17

Questão
____ fragmentation allows us to break a single object into two or more segments or fragments.
Responda
  • Horizontal
  • Vertical
  • Data
  • Mixed

Questão 18

Questão
With ____ data allocation, the database is divided into several disjointed parts and stored at sev-eral sites.
Responda
  • centralized
  • decentralized
  • partitioned
  • replicated

Questão 19

Questão
The ____ rule requires that all copies of data fragments be identical.
Responda
  • shared fragment
  • mutual consistency
  • horizontal fragmentation
  • replication

Questão 20

Questão
Which of the following is a problem with a centralized database?
Responda
  • High cost
  • Good performance from remote locations
  • Poor performance from the main location
  • Lack of storage

Questão 21

Questão
The components of a data warehouse are ____.
Responda
  • integrated
  • volatile
  • object-oriented
  • decentralized

Questão 22

Questão
Which of the following is a rule that defines the data warehouse?
Responda
  • Environments are integrated
  • Data warehouse contains historical data over a long time horizon
  • Data are object-oriented
  • Data are subject-oriented

Questão 23

Questão
Which of the following is a characteristic of an OLAP?
Responda
  • Uses single dimensional data analysis techniques
  • Provides introductory database support and complex end user interfaces
  • Provides introductory end-user interfaces
  • Supports client/server architecture

Questão 24

Questão
____ data must conform to uniform structures and formats to avoid data conflicts.
Responda
  • Data mart
  • Database
  • Data warehouse
  • Data analysis

Questão 25

Questão
Multidimensional data analysis refers to the processing of data such that data are viewed as part of the ____ structure.
Responda
  • semidimensional
  • multidimensional
  • one-dimensional
  • two-dimensional

Questão 26

Questão
MOLAP extends OLAP functionality to multidimensional ____ management systems.
Responda
  • online
  • database
  • processing
  • data

Questão 27

Questão
MOLAP's premise is that ____ databases are best suited to manage, store, and analyze multi-dimensional data.
Responda
  • multidimensional
  • one-dimensional
  • two-dimensional
  • relational

Questão 28

Questão
The ____ hierarchy provides a top-down data organization that is used for two main purposes: aggregation and drill-down/roll-up data analysis.
Responda
  • relational
  • dimensional
  • multidimensional
  • attribute

Questão 29

Questão
During the data ____ phase of data mining, common characteristics or patterns are identified.
Responda
  • analysis
  • preparation
  • extraction
  • acquisition

Questão 30

Questão
During the ____ phase of data mining, the data-mining findings are used to predict future behav-ior and forecast business outcomes.
Responda
  • analysis and classification
  • preparation
  • prognosis
  • knowledge acquisition

Questão 31

Questão
The ____ schema creates the near equivalent of a multidimensional database schema from the existing relational database.
Responda
  • star
  • square
  • OLAP
  • ROLAP

Questão 32

Questão
____ backups take place while the user is working on the database.
Responda
  • Full
  • Incremental
  • Concurrent
  • Sequential

Questão 33

Questão
A ____ is a named collection of database access privileges that authorize a user to connect to the database and use the database system resources.
Responda
  • user
  • role
  • profile
  • manager

Questão 34

Questão
At the level of top management, the database must be able to ____.
Responda
  • represent and support the company operations as closely as possible
  • deliver the data necessary for tactical decisions and planning
  • produce query results within specified performance levels
  • provide access to external and internal data to identify growth opportunities and to chart the direction of such growth

Questão 35

Questão
As a manager, the DBA must concentrate on the ____ dimensions of the database administration function.
Responda
  • control and planning
  • conflict and problem resolution
  • policies and standards
  • security and privacy

Questão 36

Questão
User-access management is a subset of ____.
Responda
  • password protection
  • authorization management
  • data integrity
  • managerial control

Questão 37

Questão
Classifying users into ____, according to common access needs, facilitates the DBA’s job of controlling and managing the access privileges of individual users.
Responda
  • user groups
  • sections
  • authorization schemes
  • policy definitions

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