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

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cRecoverable schedule

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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

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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

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bAverage response time

✓


c Average reaction time

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dMinimum reaction time

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View Answer Average response time

Which of the following are the advantages of transaction concurrency?


aIncreased throughput

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bIncreased utilization

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cReduces average response time

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d All of the mentioned

✓



State true or false: Transactions can only run serially


aTrue

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bFalse

✓


ceither true of false

✖


dnone of these

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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

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dnone of these

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View Answer True

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