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

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bPhysical equivalence rule

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c Memory equivalence rule

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dNone of the mentioned

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


aInteresting

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bReusable

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cEfficient

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d Good

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View Answer Interesting

What is the disadvantage of cost based optimizers?


aIt is too expensive

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b It is inefficient in producing results

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cIt does not perform the desired function

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d None of the mentioned

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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

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bSpace based optimizer

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cTime based optimizer

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dNone of the mentioned

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View Answer Cost based optimizer

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


aComplex query handling

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bMulti query optimization

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c Complex query optimization

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d Parametric query optimization

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Which of the following is a multi-query optimization technique


a Shared scan optimization

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bParametric query optimization

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cIndex optimization

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d All of the mentioned

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


aComplex query handling

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b Multi query optimization

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c Complex query optimization

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d Parametric query optimization

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


aUpdation problem

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bIncremental problem

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c Halloween problem

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dOptimization problem

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View Answer Halloween problem

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


a Efficacies

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bWorkload

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cSelection

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dBalancers

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View Answer Workload

What are differentials in view management?


aThe differences between relations

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b The changes made to a relation

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cThe changes made to an expression

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dMore than one of the mentioned

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