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


c A sample having suppressive representation of a relation


dNone of the mentioned


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


b Divides range of values into equal sized ranges


cDivides the range of values into ideally sized ranges


dDoes not divide the range of values.



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


aHistogram


b Pie chart


cLine graph


dNone of the mentioned


View Answer Histogram

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


a Number of tuples


bNumber of blocks


c Size of a tuple of a relation


d All of the mentioned



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


aCorrelation


bDecorrelation


cCache handling


dJoin replacement


View Answer Decorrelation

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


aCaching


b Decorrelated evaluation


cCorrelated evaluation


d Time based evaluation


View Answer Correlated evaluation

Caching and reuse of query plans is called as ________


aQuery caching


b Plan caching


c Plan memorizing


dNone of the mentioned


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


b Left deep join orders


cOuter join orders


dNone of the mentioned



Optimizers use __________ to reduce the cost of optimization.


a Analyzers


bStatistics


cHeuristics


d Caches


View Answer Heuristics

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


aTrue


bFalse


ceither true of false


dnone of these


View Answer True

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