Relational Database Management System Mcqs

Page No. 39

If the operations do not wait to produce tuples, then it is called as _________


aDemand driven pipeline


bProducer driven pipeline


cQuery driven pipeline


dNone of the mentioned



If the system makes repeated requests for tuples from the operation at the top of the table, it is called as _________


aDemand driven pipeline


bProducer driven pipeline


cQuery driven pipeline


dNone of the mentioned



The result of each intermediate operation are created and then are used for valuation of the next level operations, this evaluation is called as ________


aChain evaluation


bPipeline evaluation


cMaterialized evaluation


dDemand driven evaluation



If the results of one operation are passed on to the other, it is called as ________


a Chain


bPipeline


cMaterialized


dTree


View Answer Pipeline

State true or false: Multiple equivalence rules can be used one after the other on a query


aTrue


bFalse


ceither true of false


dnone if these


View Answer True

Which of the following set operations does the selection operation distribute over?


a Union


b Intersection


cDifference


dAll of the mentioned


View Answer All of the mentioned

Which of the following operations is associative


aSet union


bSet intersection


c Set difference


dTheta join


View Answer Theta join

Theta join operations are


aCommutative


b Associative


cDistributive under projection


dAll of the mentioned


View Answer All of the mentioned

If no rule can be derived from any combination of others then the set of rules is said to be ________


aPrimitive


b Axiomatic


cMinimal


dAtomic


View Answer Minimal

State true or false: The projection operation does not distribute over the union operation


aTrue


bFalse


ceither true of false


dnone of these


View Answer False

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