Relational Database Management System Mcqs

Page No. 45

A schedule is __________ if it is conflict equivalent to a serial schedule.


aConflict serializable


bConflicting


cNon serializable


d None of the mentioned


View Answer Conflict serializable

If a schedule S can be transformed into a schedule S’ by a series of swaps of non-conflicting instructions, then S and S’ are


aNon conflict equivalent


bEqual


cConflict equivalent


d Isolation equivalent


View Answer Conflict equivalent

I and J are _________ if they are operations by different transactions on the same data item, and at least one of them is a write operation.


aConflicting


bOverwriting


cIsolated


d Durable


View Answer Conflicting

Which of the following is not a type of a schedule?


aPartial schedule


bDependent schedule


cRecoverable schedule


dNone of the mentioned


View Answer None of the mentioned

If a schedule is equivalent to a serial schedule, it is called as a _________


aSerializable schedule


b Equivalent schedule


c Committed schedule


dNone of the mentioned


View Answer Serializable schedule

The average time for a transaction to be completed after it has been submitted is called as __________


aMinimum response time


bAverage response time


c Average reaction time


dMinimum reaction time


View Answer Average response time

Which of the following are the advantages of transaction concurrency?


aIncreased throughput


bIncreased utilization


cReduces average response time


d All of the mentioned



State true or false: Transactions can only run serially


aTrue


bFalse


ceither true of false


dnone of these


View Answer False

A ___________ is one where, for each pair of transactions Ti and Tj such that Tj reads a data item previously written by Ti , the commit operation of Ti appears before the commit operation of Tj


aPartial schedule


bDependent schedule


cRecoverable schedule


dNone of the mentioned


View Answer Recoverable schedule

State true or false: Every cascadeless schedule is also recoverable


a True


bFalse


ceither true of false


dnone of these


View Answer True

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