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By ______ an area on disk in certain ways, one can make it represent a bit value of either zero (0) or one (1).

A. Vulcanizing

B. Galvanizing

C. Magnetizing

D. Passing UV rays

Correct Answer :

C. Magnetizing


Related Questions

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Checkpoints are a part of

A. Recovery measures.

B. Security measures.

C. Concurrency measures.

D. uthorization measures.

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_____ First proposed the process of normalization.

A. Edgar. W

B. Edward Stephen

C. Edgar F. Codd

D. Edward Codd

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Relations produced from an E-R model will always be

A. First normal form.

B. Second normal form.

C. Third normal form.

D. Fourth normal form.

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Dependency preservation is not guaranteed in

A. BCNF

B. 3NF

C. PJNF

D. DKNF

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The part of a database management system which ensures that the data remains in a consistent state is

A. authorization and integrity manager

B. buffer manager

C. transaction manager

D. file manager

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DFD stands for

A. Data Flow Document

B. Data File Diagram

C. Data Flow Diagram

D. Non of the above

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In an ER model,_____ is described in the database by storing its data.

A. Entity

B. Attribute

C. Relationship

D. Notation

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Tree structures are used to store data in

A. Network model.

B. Relational model.

C. Hierarchical model.

D. File based system.

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The metadata is created by the

A. DML compiler

B. DML pre-processor

C. DDL interpreter

D. Query interpreter

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The normalization was first proposed by .

A. Code

B. Codd

C. Boyce Codd

D. Boyce

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As per equivalence rules for query transformation, selection operation distributes over

A. Union.

B. Set difference.

C. Intersection.

D. All of the above.

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A table can have only one

A. Secondary key

B. Alternate key

C. Unique key

D. Primary key

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Manager salary details are hidden from the employee .This is

A. Conceptual level data hiding.

B. External level data hiding.

C. Physical level data hiding.

D. None of these.

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An advantage of views is

A. Data security

B. Derived columns

C. Hiding of complex queries

D. All of the above

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A weak entity has an ______ dependency on its owner entity, which can be used for both ON UPDATE and ON DELETE.

A. Direct

B. Indirect

C. Existence

D. No

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In an ER diagram the ___shape specifies the Attibute and a ____ shape specifies the primary key attribute.

A. Oval; An oval with an underlined attribute

B. Circle; A circle with bolded attribute inside it

C. Diamond; A bolded attribute

D. Square; An attribute within the square

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______defines the structure of a relation which consists of a fixed set of attribute-domain pairs.

A. Instance

B. Program

C. Schema

D. Super Key

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In an E-R, Y is the dominant entity and X is a subordinate entity. Then which of the following is incorrect :

A. Operationally, if Y is deleted, so is X

B. existence is dependent on Y.

C. Operationally, if X is deleted, so is Y.

D. Operationally, if X is deleted, & remains the same.

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When an E-R diagram is mapped to tables, the representation is redundant for

A. weak entity sets

B. weak relationship sets

C. strong entity sets

D. strong relationship sets

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Which of the following is not a property of transactions?

A. Atomicity

B. Concurrency

C. Isolation

D. Durability

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If an entity can belong to only one lower level entity then the constraint is

A. disjoint

B. partial

C. overlapping

D. single

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Create a table with the following attributes: Employee(EMPNO integer, EMPNAME of 10 characters)

A. Create table Employee(EMPNO int, EMPNAME char(10));

B. Create table Employee(EMPNO integer, EMPNAME String(10));

C. Create table Emplo(EMPNO number, EMPNAME string);

D. Create table Emp(EMPNO int, EMPNAME char(10));

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The set of all values that can be taken by the attribute is called as _______ of the attribute.

A. Tuple

B. Cardinality

C. Degree

D. Domain

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What is data integrity?

A. It is the data contained in database that is non redundant.

B. It is the data contained in database that is accurate and consistent.

C. It is the data contained in database that is secured.

D. It is the data contained in database that is shared.

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Consider the join of relation R with a relation S. If R has m tuples and S has n tuples, then the maximum and minimum size of the join respectively are

A. m+n and 0

B. m+n and |m-n|

C. mn and 0

D. mn and m+n

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The language that requires a user to specify the data to be retrieved without specifying exactly how to get it is

A. Procedural DML.

B. Non-Procedural DML.

C. Procedural DDL.

D. Non-Procedural DDL.

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A ____ key specifies a uniqueness constraint that no two distinct tuples in any state r of relation R can have the same value for super key.

A. Sub

B. Parent

C. Candidate

D. Super

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Which two files are used during operation of the DBMS?

A. Query languages and utilities

B. DML and query language

C. Data dictionary and transaction log

D. Data dictionary and query language

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For correct behaviour during recovery, undo and redo operation must be

A. Commutative

B. Associative

C. idempotent

D. distributive

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A _____ is used to define overall design of the database

A. code

B. data definition language

C. application program

D. schema