Relational Database Management System Mcqs

Page No. 52

In _______ schemes, each write operation creates a new version of Q


aMultiversion

✓


bSnapshot isolation

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cLock based

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dTimestamp

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View Answer Multiversion

State true or false: Exclusive locks are held until transaction commit in degree two consistency


aTrue

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b False

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ceaither true and false

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dnone of these

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View Answer True

Which of the following does cursor stability ensure


aThe tuple that is currently being processed by the iteration is locked in shared mode

✓


bThe tuple that is currently being processed is not locked in shared mode

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cAny modified tuples are not locked in exclusive mode

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dNone of the mentioned

✖



To prevent the phantom phenomenon, _______ is used


aKey value locking

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bNext key locking

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cPrevious key locking

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dNone of the mentioned

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View Answer Next key locking

State true or false: Key value locking provides increased concurrency


aTrue

✓


bFalse

✖


ceither true and false

✖


dnone of these

✖


View Answer True

Transactions that involve user interactions are called __________


aValidations

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bConversations

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cInterfaces

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dNone of the mentioned

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View Answer Conversations

_________ is a form of two degree consistency designed for programs that iterate over tuples of a relation by using cursors.


aCursor stability

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b Serializability

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cNon-serializability

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dPredicate locking

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View Answer Cursor stability

Which of the following is included in the operational mechanism of the index locking protocol?


aEvery transaction must have at least one index

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bA transaction that performs a lookup must acquire a shared lock on all the index leaf nodes that it accesses

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cThe rule of the two phase locking mechanism must be observed

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dAll of the mentioned

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View Answer All of the mentioned

Which of the following does not lock the entire index


aPhantom locking

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bPhantom problem

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cIndex locking

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dIndex problem

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View Answer Index locking

________ deletes a data item from a database


aDelete(Q)

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bInsert(Q)

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cDrop(Q)

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dNone of the mentioned

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View Answer Delete(Q)

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