Relational Database Management System Mcqs

Page No. 47

Which of the following is a transaction isolation level as specified by SQL standard?


aSerializable


bRepeatable read


cRead committed


dAll of the mentioned


View Answer Serializable

If a transaction may release locks but may not obtain any locks, it is said to be in ______ phase


aGrowing phase


bShrinking phase


c Deadlock phase


dStarved phase


View Answer Deadlock phase

If a transaction may obtain locks but may not release any locks then it is in _______ phase


aGrowing phase


bShrinking phase


cDeadlock phase


dStarved phase


View Answer Growing phase

The two phase locking protocol consists which of the following phases?


aGrowing phase


b Shrinking phase


cMore than one of the mentioned


d None of the mentioned



If a transaction Ti may never make progress, then the transaction is said to be ____________


a Deadlocked


b Starved


cCommitted


d Rolled back


View Answer Starved

The protocol that indicates when a transaction may lock and unlock each of the data items is called as __________


a Locking protocol


bUnlocking protocol


cGranting protocol


d Conflict protocol


View Answer Locking protocol

The situation where no transaction can proceed with normal execution is known as ________


aRoad block


b Deadlock


cExecution halt


d Abortion


View Answer Deadlock

State true or false: It is not necessarily desirable for a transaction to unlock a data item immediately after its final access


aTrue


bFalse


ceither true of false


dnone of these


View Answer True

A transaction is made to wait until all ________ locks held on the item are released


aCompatible


bIncompatible


cConcurrent


dEquivalent


View Answer Compatible

If a transaction can be granted a lock on an item immediately in spite of the presence of another mode, then the two modes are said to be ________


aConcurrent


b Equivalent


c Compatible


dExecutable


View Answer Compatible

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