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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