Database Management Systems Mcqs

Page No. 56

Which statement is true regarding external tables?


aThe default REJECT LIMIT for external tables is UNLIMITED


bThe data and metadata for an external table are stored outside the database


cORACLE_LOADER and ORACLE_DATAPUMP have exactly the same functionality when used with an external table


dThe CREATE TABLE AS SELECT statement can be used to unload data into regular table in the database from an external table



__________ are used to ensure that transactions access each data item in order of the transactions’ ____ if their accesses conflict.


aZone


bRelay


cLine


dTimestamps


View Answer Timestamps

A concurrency-control policy such as this one leads to ______ performance since it forces transactions to wait for preceding transactions to finish before they can start.


aGood


bAverage


cPoor


dUnstable


View Answer Poor

In concurrency control policy the lock is obtained on


aEntire database


bA particular transaction alone


cAll the new elements


dAll of the mentioned


View Answer Entire database

Which server can join the indexes when only multiple indexes combined can cover the query:


aSQL


bDBMS


cRDBMS


dAll of the mentioned


View Answer SQL

Which are types of recovery control techniques:


aDeferred update


bImmediate update


cAll of the Mentioned


dNone of the Mentioned


View Answer All of the Mentioned

How many types of recovery control techniques:


a2


b3


c4


d5


View Answer 2

Copying files to secondary or specific devices is known as ______


aRetrieve


bBackup


cRecovery


dDeadlock


View Answer Backup

Database security helps organizations to protect data from _____


aInternal users


bExternal users


cNon-external users


dNon internal users


View Answer External users

Optimization basically related to the Rewrite module is termed as_______


aSemantic query optimization


bGlobal query optimization


cAll of the Mentioned


dNone of the Mentioned



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