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Database Design

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Database Quiz on Database Design, created by Matthew Rook on 04/04/2019.
Matthew Rook
Quiz by Matthew Rook, updated more than 1 year ago
Matthew Rook
Created by Matthew Rook over 5 years ago
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Resource summary

Question 1

Question
What is Program-Data Redundancy?
Answer
  • changing the structure or storage characteristics would require changing the applications that access it
  • Unnecessary storage of the same data in different places
  • different and conflicting versions of the same data occur at different places
  • Abnormalities when all changes in redundant data are not made correctly

Question 2

Question
What is Data Redundancy?
Answer
  • changing the structure or storage characteristics would require changing the applications that access it
  • different and conflicting versions of the same data occur at different places
  • Abnormalities when all changes in redundant data are not made correctly
  • Unnecessary storage of the same data in different places

Question 3

Question
What is Data Inconsistancy?
Answer
  • Abnormalities when all changes in redundant data are not made correctly
  • Unnecessary storage of the same data in different places
  • changing the structure or storage characteristics would require changing the applications that access it
  • different and conflicting versions of the same data occur at different places

Question 4

Question
What is Data Anomalies?
Answer
  • changing the structure or storage characteristics would require changing the applications that access it
  • different and conflicting versions of the same data occur at different places
  • Unnecessary storage of the same data in different places
  • Abnormalities when all changes in redundant data are not made correctly

Question 5

Question
Data Dictionary Management - Data dictionary: Stores [blank_start]definitions[blank_end] of the [blank_start]data[blank_end] [blank_start]elements[blank_end] and their [blank_start]relationships[blank_end]
Answer
  • definitions
  • data
  • elements
  • relationships

Question 6

Question
[blank_start]Data storage management[blank_end] - Performance tuning: Ensures [blank_start]efficient[blank_end] [blank_start]performance[blank_end] of the [blank_start]database[blank_end] in terms of [blank_start]storage[blank_end] and access [blank_start]speed[blank_end]
Answer
  • Data storage management
  • efficient
  • performance
  • database
  • storage
  • speed

Question 7

Question
[blank_start]Data transformation and presentation[blank_end] - Transforms entered data to conform to required data structures
Answer
  • Data transformation and presentation

Question 8

Question
[blank_start]Security management[blank_end] - Enforces user security and data privacy
Answer
  • Security management

Question 9

Question
[blank_start]Multiuser access control[blank_end] - Sophisticated algorithms ensure that multiple users can access the database concurrently without compromising its integrity
Answer
  • Multiuser access control

Question 10

Question
[blank_start]Backup and recovery management[blank_end] - Enables recovery of the database after a failure
Answer
  • Backup and recovery management

Question 11

Question
[blank_start]Data integrity management[blank_end] - Minimizes redundancy and maximizes consistency
Answer
  • Data integrity management

Question 12

Question
[blank_start]Database[blank_end] [blank_start]access[blank_end] [blank_start]languages[blank_end] [blank_start]and[blank_end] [blank_start]application[blank_end] [blank_start]programming[blank_end] interfaces - Query language: Lets the user specify what must be done without having to specify how • Structured Query Language (SQL): De facto query language and data access standard supported by the majority of DBMS vendors
Answer
  • Database
  • access
  • languages
  • and
  • application
  • programming

Question 13

Question
[blank_start]Database communication interfaces[blank_end] - Accept end-user requests via multiple, different network environments
Answer
  • Database communication interfaces

Question 14

Question
Abstraction of a real-world object or event is an example of Data Models?
Answer
  • True
  • False

Question 15

Question
Collection of related concepts used to describe the structure of a database, i.e. unique objects, data types, relationships, and constraints • Useful for supporting a specific problem domain • Simple representations of complex real-world data structures This is an example of Data Modelling
Answer
  • True
  • False

Question 16

Question
A Model refers to the process of creating a specific data model for a determined problem domain.
Answer
  • True
  • False

Question 17

Question
An [blank_start]entity[blank_end] is a person, place, thing, or event about which data will be collected and stored.
Answer
  • entity

Question 18

Question
An [blank_start]attribute[blank_end] is a characteristic of an entity
Answer
  • attribute

Question 19

Question
A [blank_start]relationship[blank_end] describes an association among entities.
Answer
  • relationship

Question 20

Question
A [blank_start]constraint[blank_end] is a restriction placed on the data
Answer
  • constraint

Question 21

Question
• Logical Data Independence:
Answer
  • Change the schema at one level of a database system without having to change the schema at the next higher level.
  • A change in storage devices or methods and even a change in operating system will not affect the internal model.
  • Change the internal model without affecting the conceptual model.
  • Change the physical model without affecting the internal model
  • Recoding, adding fields (e.g. adding an email address to a student file) in the database should not affect applications

Question 22

Question
Data Independence:
Answer
  • Change the schema at one level of a database system without having to change the schema at the next higher level.
  • A change in storage devices or methods and even a change in operating system will not affect the internal model.
  • Change the internal model without affecting the conceptual model.
  • Change the physical model without affecting the internal model
  • Recoding, adding fields (e.g. adding an email address to a student file) in the database should not affect applications

Question 23

Question
Physical Data Independence:
Answer
  • Recoding, adding fields (e.g. adding an email address to a student file) in the database should not affect applications
  • Change the physical model without affecting the internal model
  • Change the internal model without affecting the conceptual model.
  • A change in storage devices or methods and even a change in operating system will not affect the internal model.
  • Change the schema at one level of a database system without having to change the schema at the next higher level.

Question 24

Question
[blank_start]Primary Key[blank_end] - An attribute that can identify each row in a table uniquely. Cannot be null or duplicate
Answer
  • Primary Key

Question 25

Question
[blank_start]Composite Primary Key[blank_end] - Composed of more than one attribute
Answer
  • Composite Primary Key

Question 26

Question
[blank_start]Secondary Key[blank_end] - Unique key other than primary key, Strictly for data retrieval purposes, E.g. Customers do not remember their ID, but they do remember their phone number!
Answer
  • Secondary Key

Question 27

Question
[blank_start]Entity integrity[blank_end] - Each row (entity instance) in the table has its own unique identity
Answer
  • Entity integrity

Question 28

Question
[blank_start]Foreign key[blank_end] - An attribute whose values match primary key values in the related table
Answer
  • Foreign key

Question 29

Question
[blank_start]Referential integrity[blank_end] - FK contains a value that refers to an existing valid tuple (row) in another relation
Answer
  • Referential integrity

Question 30

Question
[blank_start]UNION[blank_end] will show all rows in the tables except duplicates
Answer
  • UNION

Question 31

Question
[blank_start]UNION ALL[blank_end] will show all rows from the tables including duplicates
Answer
  • UNION ALL

Question 32

Question
[blank_start]PROJECT[blank_end] - Unary operator that yields a vertical subset of a table. Yield all values for selected attributes
Answer
  • PROJECT

Question 33

Question
[blank_start]INTERSECT[blank_end] - Yields only the rows that appear in both tables
Answer
  • INTERSECT

Question 34

Question
[blank_start]DIFFERENCE[blank_end] - Yields all rows in one table that are not found in the other table
Answer
  • DIFFERENCE

Question 35

Question
[blank_start]Identifiers[blank_end]: one or more attributes that uniquely identify each entity instance.
Answer
  • Identifiers

Question 36

Question
[blank_start]Composite attribute[blank_end]: Attribute that can be subdivided to yield additional attributes
Answer
  • Composite attribute

Question 37

Question
[blank_start]Simple attribute[blank_end]: Attribute that cannot be subdivided
Answer
  • Simple attribute

Question 38

Question
[blank_start]Single valued attribute[blank_end]: Attribute that has only a single value.
Answer
  • Single valued attribute

Question 39

Question
[blank_start]Multivalued attribute[blank_end]s: Attributes that have many values.
Answer
  • Multivalued attribute

Question 40

Question
[blank_start]Derived attribute[blank_end]: Attribute whose value is calculated from other attributes
Answer
  • Derived attribute
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