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

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cRead committed

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dAll of the mentioned

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View Answer Serializable

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


aGrowing phase

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bShrinking phase

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c Deadlock phase

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dStarved phase

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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

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cDeadlock phase

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dStarved phase

✖


View Answer Growing phase

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


aGrowing phase

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b Shrinking phase

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cMore than one of the mentioned

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d None of the mentioned

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


a Deadlocked

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b Starved

✓


cCommitted

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d Rolled back

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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

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bUnlocking protocol

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cGranting protocol

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d Conflict protocol

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View Answer Locking protocol

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


aRoad block

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b Deadlock

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cExecution halt

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d Abortion

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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

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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

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


aCompatible

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bIncompatible

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cConcurrent

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dEquivalent

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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

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b Equivalent

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c Compatible

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dExecutable

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View Answer Compatible

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