Relational Database Management System Mcqs

Page No. 46

The phenomenon in which one failure leads to a series of transaction rollbacks is called as ________


aCascading rollback

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b Cascadeless rollback

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c Cascade cause

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dNone of the mentioned

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View Answer Cascading rollback

A transaction that performs only one operation is called as a _________


aPartial schedule

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bComplete schedule

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c Dependent schedule

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d Independent schedule

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View Answer Partial schedule

What is the disadvantage of locking?


aDoes not control concurrency

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bIs not atomic

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cIs not durable

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dHas a poor degree of concurrency

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In ___________ isolation each transaction is given its own version of the database


aTimestamp

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bSnapshot

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cLock based

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dAll of the mentioned

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View Answer Snapshot

When is a timestamp allotted


aWhen execution begins

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b When execution is taking place

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cWhen execution is completed

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dNone of the mentioned

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View Answer When execution begins

State true or false: All the isolation levels disallow dirty writes


aTrue

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bFalse

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ceither true of false

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dnone of these

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View Answer True

__________ allows uncommitted data to be read


aRead uncommitted

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bSerializable

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cRepeatable read

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dRead committed

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View Answer Read uncommitted

. ________ allows only committed data to be read, but does not require repeatable reads


a Read uncommitted

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bSerializable

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cRepeatable read

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d Read committed

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View Answer Read committed

________ allows only committed data to be read and further requires that no other transaction is allowed to update it between two reads of a data item by a transaction.


aRead uncommitted

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bSerializable

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cRepeatable read

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dRead committed

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View Answer Repeatable read

State true or false: Serializable level may allow both serializable and non-serializable


aTrue

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b False

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ceither true of false

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dnone of these

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View Answer True

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