Relational Database Management System Mcqs

Page No. 42

The rule that allows transformation of a logical operation to a physical operation is called


aLogical equivalence rule


bPhysical equivalence rule


c Memory equivalence rule


dNone of the mentioned



A particular sort order is said to be _________ sort order if it could be useful for a later operation.


aInteresting


bReusable


cEfficient


d Good


View Answer Interesting

What is the disadvantage of cost based optimizers?


aIt is too expensive


b It is inefficient in producing results


cIt does not perform the desired function


d None of the mentioned


View Answer It is too expensive

A ________ explores the space of all query evaluation plans that are equivalent to a given query


aCost based optimizer


bSpace based optimizer


cTime based optimizer


dNone of the mentioned


View Answer Cost based optimizer

If a query is optimized without providing specific values for its parameters the technique is called __________


aComplex query handling


bMulti query optimization


c Complex query optimization


d Parametric query optimization



Which of the following is a multi-query optimization technique


a Shared scan optimization


bParametric query optimization


cIndex optimization


d All of the mentioned



Reducing the complexity of complex queries by similarly handling sub-queries is known as ______


aComplex query handling


b Multi query optimization


c Complex query optimization


d Parametric query optimization



The problem of an update affecting the execution of a query associated with the update is known as the _________


aUpdation problem


bIncremental problem


c Halloween problem


dOptimization problem


View Answer Halloween problem

The sequence of queries that reflect the typical load on the system are known as ________


a Efficacies


bWorkload


cSelection


dBalancers


View Answer Workload

What are differentials in view management?


aThe differences between relations


b The changes made to a relation


cThe changes made to an expression


dMore than one of the mentioned



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