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Question
A passive data dictionary is one that is updated automatically with every database access to keep its access information up to date.a. True
b. False
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.
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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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Converting a database format from 1NF to 2NF is a complex process.
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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Repeating groups must be eliminated by ensuring that each row defines a single entity.
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A table is in BCNF if every determinant in the table is a foreign key.
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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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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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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The hierarchical model is software-independent.a. Trueb. False