Database Management Systems Mcqs

Page No. 62

__________ states that only valid data will be written to the database.


aConsistency


bAtomicity


cDurability


dIsolation


View Answer Consistency

The property of a transaction that persists all the crashes is


aAtomicity


bDurability


cIsolation


dAll of the mentioned


View Answer Durability

The database system must take special actions to ensure that transactions operate properly without interference from concurrently executing database statements. This property is referred to as


aAtomicity


bDurability


cIsolation


dAll of the mentioned


View Answer Isolation

Which of the following has “all-or-none” property?


aAtomicity


bDurability


cIsolation


dAll of the mentioned


View Answer Atomicity

Identify the characteristics of transactions


aAtomicity


bDurability


cIsolation


dAll of the mentioned


View Answer All of the mentioned

A transaction is delimited by statements (or function calls) of the form __________


aBegin transaction and end transaction


bStart transaction and stop transaction


cGet transaction and post transaction


dRead transaction and write transaction



Consider money is transferred from (1)account-A to account-B and (2) account-B to account-A. Which of the following form a transaction?


aOnly 1


bOnly 2


cBoth 1 and 2 individually


dEither 1 or 2



Instead of locking index leaf nodes in a two-phase manner, some index concurrency-control schemes use ___________ on individual key values, allowing other key values to be inserted or deleted from the same leaf.


aB+ tree locking


bLink level locking


cKey-value locking


dNext value locking


View Answer Key-value locking

B-link tree requires a pointer to its __________ sibling.


aUpper


bLower


cRight


dLeft


View Answer Right

In crabbing protocol to inset or delete a key value the leaf node has to be locked in ___________ mode.


aShared


bExclusive


cRead only


dNone of the mentioned


View Answer Exclusive

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