Relational Database Management System Mcqs

Page No. 41

What kind of a sample must be used for statistical analysis?


aA random sample

✓


bA sample having excessive representation of a relation

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c A sample having suppressive representation of a relation

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dNone of the mentioned

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View Answer A random sample

What is the function of the equi-width histogram?


aAdjusts boundaries of the ranges such that each range has the same number of values

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b Divides range of values into equal sized ranges

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cDivides the range of values into ideally sized ranges

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dDoes not divide the range of values.

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Most databases store the distribution of values for each attribute as a __________


aHistogram

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b Pie chart

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cLine graph

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dNone of the mentioned

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View Answer Histogram

Which of the following information does the database system catalog store?


a Number of tuples

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bNumber of blocks

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c Size of a tuple of a relation

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d All of the mentioned

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The process of replacing a nested query with a query with a join is known as _________


aCorrelation

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bDecorrelation

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cCache handling

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dJoin replacement

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View Answer Decorrelation

What technique is used for the evaluation of a query with a nested sub query?


aCaching

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b Decorrelated evaluation

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cCorrelated evaluation

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d Time based evaluation

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View Answer Correlated evaluation

Caching and reuse of query plans is called as ________


aQuery caching

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b Plan caching

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c Plan memorizing

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dNone of the mentioned

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View Answer Plan caching

The join orders where the right operand of each join is in one of the initial relations are called as ________


aRight deep join orders

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b Left deep join orders

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cOuter join orders

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dNone of the mentioned

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Optimizers use __________ to reduce the cost of optimization.


a Analyzers

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bStatistics

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cHeuristics

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d Caches

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View Answer Heuristics

State true or false: Making multiple copies of the same sub-expressions must be avoided


aTrue

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bFalse

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ceither true of false

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dnone of these

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View Answer True

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