Relational Database Management System Mcqs

Page No. 52

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


aMultiversion


bSnapshot isolation


cLock based


dTimestamp


View Answer Multiversion

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


aTrue


b False


ceaither true and false


dnone of these


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


cAny modified tuples are not locked in exclusive mode


dNone of the mentioned



To prevent the phantom phenomenon, _______ is used


aKey value locking


bNext key locking


cPrevious key locking


dNone of the mentioned


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


bConversations


cInterfaces


dNone of the mentioned


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


b Serializability


cNon-serializability


dPredicate locking


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


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


cThe rule of the two phase locking mechanism must be observed


dAll of the mentioned


View Answer All of the mentioned

Which of the following does not lock the entire index


aPhantom locking


bPhantom problem


cIndex locking


dIndex problem


View Answer Index locking

________ deletes a data item from a database


aDelete(Q)


bInsert(Q)


cDrop(Q)


dNone of the mentioned


View Answer Delete(Q)

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