Database Management Systems Mcqs

Page No. 54

In a ____________ the system scans each file block and tests all records to see whether they satisfy the selection condition


aIndex Search


bLinear search


cFile scan


dAccess paths


View Answer Linear search

In query processing, the ___________ is the lowest-level operator to access data.


aIndex Search


bLinear search


cFile scan


dAccess paths


View Answer File scan

Ensuring isolation property is the responsibility of the


aRecovery-management component of the DBMS


bConcurrency-control component of the DBMS


cTransaction-management component of the DBMS


dBuffer management component in DBMS



A table can be logically connected to another table by defining a


aSuper key


bCandidate key


cPrimary key


dUnique key


View Answer Primary key

The relationship between DEPARTMENT and EMPLOYEE is a


aOne-to-one relationship


bOne-to-many relationship


cMany-to-many relationship


dMany-to-one relationship



Which of the following terms does refer to the correctness and completeness of the data in a database?


aData security


bData constraint


cData independence


dData integrity


View Answer Data integrity

Which of the following is an attribute that can uniquely identify a row in a table?


aSecondary key


bCandidate key


cForeign key


dAlternate key


View Answer Candidate key

Which of the following schemas does define a view or views of the database for particular users?


aInternal schema


bConceptual schema


cPhysical schema


dExternal schema


View Answer External schema

A collection of data designed to be used by different people is called a/an


aOrganization


bDatabase


cRelationship


dSchema


View Answer Database

SQL can be used to:


aCreate database structures only


bQuery database data only


cModify database data only


dAll of the mentioned


View Answer All of the mentioned

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