Relational Database Management System Mcqs

Page No. 44

Which of the following is not a property of a transaction?


a Atomicity


bSimplicity


c Isolation


dDurability


View Answer Simplicity

Execution of translation in isolation preserves the _________ of a database


aAtomicity


bConsistency


c Durability


dAll of the mentioned


View Answer Consistency

. Which of the following is a property of transactions?


aAtomicity


bDurability


cIsolation


dAll of the mentioned


View Answer All of the mentioned

The “all-or-none” property is commonly referred to as _________


aIsolation


bDurability


cAtomicity


dNone of the mentioned


View Answer Atomicity

Collections of operations that form a single logical unit of work are called __________


a Views


bNetworks


cUnits


dTransactions


View Answer Transactions

Which of the following is the most expensive method?


aTimestamping


bPlain locking


c Predicate locking


d Snapshot isolation


View Answer Predicate locking

State true or false: If I = read(Q) and J = write(Q) then the order of I and J does not matter.


a True


b False


ceither true of false


dnone of these


View Answer False

State true or false: If I = read(Q) and J = read(Q) then the order of I and J does not matter.


aTrue


bFalse


ceither true of false


dnone of these


View Answer True

A ___________of the transactions can be obtained by finding a linear order consistent with the partial order of the precedence graph.


a Serializability order


bDirection graph


cPrecedence graph


dScheduling scheme



The set of ________ in a precedence graph consists of all the transactions participating in the schedule


aVertices


bEdges


cDirections


dNone of the mentioned'


View Answer Vertices

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