Relational Database Management System Mcqs

Page No. 48

A transaction can proceed only after the concurrency control manager ________ the lock to the transaction


a Grants

✓


bRequests

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c Allocates

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dNone of the mentioned

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View Answer Grants

If a transaction has obtained a ________ lock, it can both read and write on the item


aShared mode

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bExclusive mode

✓


cRead only mode

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dWrite only mode

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View Answer Exclusive mode

If a transaction has obtained a __________ lock, it can read but cannot write on the item


aShared mode

✓


bExclusive mode

✖


cRead only mode

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dWrite only mode

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View Answer Shared mode

Which of the following steps must be taken while choosing a victim?


aAvoiding starvation

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b Number of transactions involved in rollback

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cData items used by the transaction

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dAll of the mentioned

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View Answer All of the mentioned

State true or false: Partial rollback is not possible.


aTrue

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bFalse

✓


ceither true of false

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dnone f these

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View Answer False

How do we generally recover from a deadlock?


aBy aborting all the transactions

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bBy rolling back all the transactions

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cBy rolling back only a selected number of transactions

✓


dNone of the mentioned

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The _________ graph describes deadlocks precisely


a Wound wait graph

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bWait die graph

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cWait for graph

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dNone of the mentioned

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View Answer Wait for graph

Lock timeouts have which of the following advantages?


a Unnecessary rollbacks do not occur

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bTransactions do not starve

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cIt is easy to implement

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d All of the mentioned

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State true or false: Wait die scheme is a non-preemptive technique


aTrue

✓


b False

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ceither true of false

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dnone of these

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View Answer True

Deadlocks can be prevented using


aPreemption and transaction rollbacks

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bWait and die scheme

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cWound-wait scheme

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dAll of the mentioned

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View Answer All of the mentioned

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