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

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bLinear search

✓


cFile scan

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dAccess paths

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View Answer Linear search

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


aIndex Search

✖


bLinear search

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cFile scan

✓


dAccess paths

✖


View Answer File scan

Ensuring isolation property is the responsibility of the


aRecovery-management component of the DBMS

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bConcurrency-control component of the DBMS

✓


cTransaction-management component of the DBMS

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dBuffer management component in DBMS

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


aSuper key

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bCandidate key

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cPrimary key

✓


dUnique key

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View Answer Primary key

The relationship between DEPARTMENT and EMPLOYEE is a


aOne-to-one relationship

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bOne-to-many relationship

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cMany-to-many relationship

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dMany-to-one relationship

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


aData security

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bData constraint

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cData independence

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dData integrity

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View Answer Data integrity

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


aSecondary key

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bCandidate key

✓


cForeign key

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dAlternate key

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View Answer Candidate key

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


aInternal schema

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bConceptual schema

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cPhysical schema

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dExternal schema

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View Answer External schema

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


aOrganization

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bDatabase

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cRelationship

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dSchema

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View Answer Database

SQL can be used to:


aCreate database structures only

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bQuery database data only

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cModify database data only

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dAll of the mentioned

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View Answer All of the mentioned

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