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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