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


b Cascadeless rollback


c Cascade cause


dNone of the mentioned


View Answer Cascading rollback

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


aPartial schedule


bComplete schedule


c Dependent schedule


d Independent schedule


View Answer Partial schedule

What is the disadvantage of locking?


aDoes not control concurrency


bIs not atomic


cIs not durable


dHas a poor degree of concurrency



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


aTimestamp


bSnapshot


cLock based


dAll of the mentioned


View Answer Snapshot

When is a timestamp allotted


aWhen execution begins


b When execution is taking place


cWhen execution is completed


dNone of the mentioned


View Answer When execution begins

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


aTrue


bFalse


ceither true of false


dnone of these


View Answer True

__________ allows uncommitted data to be read


aRead uncommitted


bSerializable


cRepeatable read


dRead committed


View Answer Read uncommitted

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


a Read uncommitted


bSerializable


cRepeatable read


d Read committed


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


bSerializable


cRepeatable read


dRead committed


View Answer Repeatable read

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


aTrue


b False


ceither true of false


dnone of these


View Answer True

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