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Question
_______________is a disadvantage of a distributed database management system (DDBMS).a. Processor dependence
b. Lack of graphical user interface
c. Security lapse
d. Increased danger of a single-point failure
Answer
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Related questions
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A dependency of one nonprime attribute on another nonprime attribute is a partial dependency.
a. True
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A determinant is any attribute whose value determines other values within a column.
a. True
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a. True
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A table is in 2NF if it is in 1NF, and it includes no partial dependencies.
a. True
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a. True
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In the context of partial dependencies, data redundancies occur because every row entry requires duplication of data.
a. True
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a. True
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a. True
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Normalization is a process that is used for changing attributes to entities.
a. True
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From a data modeling point of view, ___________--data refer to data whose values change over time and for which one must keep a history of the data changes.
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The " __________________" characteristic of a primary key states that the primary key must uniquely identify each entity instance, must be able to guarantee unique values, and must not contain nulls.a. unique valuesb. nonintelligentc. preferably single-attributed. security-complaint
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An entity cluster is formed by combining multiple interrelated entities into_______________ .a. a single abstract entity objectb. multiple abstract entity objectsc. a single entity objectd. multiple entity objects
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______________is the bottom-up process of identifying a higher-level, more generic entity supertype from lower-level entity subtypes.a. Specializationb. Generalizationc. Normalizationd. Total completeness
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Overlapping subtypes are subtypes that contain_______--- subsets of the supertype entity set.a. nullb. exclusivec. solitaryd. nonunique
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Which of the following is a specialization hierarchy overlapping constraint scenario in case of partial completeness?
a. Subtype sets are unique.
b. Supertype has optional subtypes.
c. Subtype discriminators cannot be null.
d. Subtype does not have a supertype.
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At the implementation level, the supertype and its subtype(s) depicted in a specialization hierarchy maintain a(n)__________ relationship.a. self-referencingb. 1:1c. 1:Md. M:N
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In_________________________ , a threepronged symbol represents the "many" side of the relationship.
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A(n)__________ is a restriction placed on the data.a. attribute b. entityc. relationship d. constraint
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A(n)________ 's main function is to help one understand the complexities of the realworld environment.a. node b. entityc. model d. database
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The hierarchical model is software-independent.a. Trueb. False