Evolution of Databases Quiz
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Questions and Answers

What is considered data?

  • Only numbers and texts
  • Any information or fact (correct)
  • Only information stored in databases
  • Physical objects only

What is the primary purpose of storing data in a database?

  • To convert data into images
  • To limit access to certain users
  • To create backups of data
  • To make data easily accessible and analyzable (correct)

Which of the following was the first type of database developed?

  • Flat File Database (correct)
  • Relational Database
  • NoSQL Database
  • Object-Oriented Database

What distinguishes NoSQL databases from earlier types of databases?

<p>They are designed for faster processing of unstructured data (A)</p> Signup and view all the answers

What function does a Database Management System (DBMS) serve?

<p>It manages and manipulates data within databases (A)</p> Signup and view all the answers

How do cloud databases differ from traditional databases?

<p>They are deployed in a cloud environment rather than on-premises (D)</p> Signup and view all the answers

What advancement followed relational databases in database evolution?

<p>Object-Oriented Databases (A)</p> Signup and view all the answers

Which characteristic is typical of early database systems like navigational databases?

<p>Inflexibility in data handling (A)</p> Signup and view all the answers

What is the primary function of a DBMS?

<p>To act as an interface between the database and its end users. (D)</p> Signup and view all the answers

Which of the following is NOT a common example of a DBMS?

<p>Python (B)</p> Signup and view all the answers

Which step is NOT part of creating an Entity-Relationship Diagram (ERD)?

<p>Identify data types (B)</p> Signup and view all the answers

What defines a weak entity?

<p>An entity that has no key attribute and depends on an identifying entity. (A)</p> Signup and view all the answers

What type of attribute must every entity have a unique value for?

<p>Key attribute (B)</p> Signup and view all the answers

In the context of an Entity-Relationship Diagram, what is cardinality?

<p>The maximum number of times an entity can participate in a relationship. (D)</p> Signup and view all the answers

What role does an Entity denote in a database?

<p>A distinct thing that exists and can be identified. (C)</p> Signup and view all the answers

What is true about derived attributes?

<p>They can be computed from other attributes. (D)</p> Signup and view all the answers

What best describes a cardinality constraint in relationships?

<p>It specifies the number of instances of one entity class associated with another. (A)</p> Signup and view all the answers

Which of the following is an example of a one-to-many relationship?

<p>Student-Advisor (C)</p> Signup and view all the answers

How is total participation represented in an Entity-Relationship diagram?

<p>With a double line between the entity set and relationship set. (B)</p> Signup and view all the answers

Which statement accurately describes partial participation?

<p>There can be instances where the entity is not involved in the relationship. (C)</p> Signup and view all the answers

What characterizes recursive relationships?

<p>The same entity type participates more than once. (D)</p> Signup and view all the answers

In a company organized into departments, which statement is correct regarding the department management?

<p>Each department has a unique manager. (D)</p> Signup and view all the answers

Which of the following best illustrates a many-to-many relationship?

<p>Student-Organization (A)</p> Signup and view all the answers

What component is NOT part of the candidate key for an applicant entity?

<p>Department_number (C)</p> Signup and view all the answers

Study Notes

Data

  • Data can be anything and everything, this may include any information or fact.
  • Data can be in any form, including images, files, voice recordings, videos, or plain text.

Database

  • A database is a container filled with data or information stored electronically in a computer system.
  • The purpose of storing data in a database is to easily access, modify, protect, and analyze it.

Evolution of Databases

  • The evolution of databases started in the 1960s with flat file databases, where data was stored in simple files like CSV or fixed length files.
  • Navigational databases, like hierarchical and network databases, were early systems used to store and manipulate data.
  • Relational databases became popular in the 1980s, followed by object-oriented databases in the 1990s.
  • NoSQL databases emerged as a response to the growth of the internet and the need for faster processing of unstructured data.
  • Cloud databases and self-driving databases are breaking new ground in data collection, storage, management, and utilization.

Database Management System (DBMS)

  • A DBMS is a software program that acts as an interface between a database and its users or programs.
  • It allows users to retrieve, update, and manage the information stored in the database.
  • DBMS also facilitates database oversight and control, including performance monitoring, tuning, backup, and recovery.
  • Some popular DBMS examples include MySQL, Microsoft Access, Microsoft SQL Server, FileMaker Pro, Oracle Database, and dBASE.

Entity-Relationship Diagram (ERD)

  • ERD is a graphical representation that depicts relationships between people, objects, places, concepts, or events within an IT system.

Importance and Uses of ERDs

  • ERDs provide a visual starting point for database design and can also be used to determine information system requirements.
  • ERDs can be used as a reference point for debugging or business process re-engineering after a relational database is deployed.

Steps to Create an ERD

  • Entity Identification
  • Relationship Identification
  • Cardinality Identification
  • Attribute Identification
  • Create the ERD

Definitions

  • Entity: A thing that exists and is distinguishable, an object or something in the environment.
    • Entity Types: Weak and Regular
  • Entity Instance: A particular occurrence of an entity.
  • Weak Entity Types:
    • Do not have a key attribute
    • Must participate in an identifying relationship with an owner or identifying entity type
    • Are identified by a combination of a partial key of the weak entity type and the particular entity they are related to in the identifying entity type.

Types of Attributes

  • Key
  • Multi-valued
  • Composite
  • Derived

Key Attribute

  • An attribute of an entity type where each entity must have a unique value.
  • For example, SSN of EMPLOYEE.
  • A key attribute can also be composite.

Candidate Key

  • An entity type may have more than one key.

Relationships

  • A connection between entity classes.
  • Cardinality of a relationship indicates the number of instances in one entity class that can or must be associated with instances in another entity class.
  • One-to-One Relationship: Citizen - Passport
  • One-to-Many Relationship: Student - Advisor, Customer - Order
  • Many-to-Many Relationship: Student - Organization, Order - Products
  • Recursive Relationships: A relationship where the same entity participates more than once.

Participation Constraint

  • Describes whether the existence of an entity depends on its relationship with another entity.
  • Total Participation (Existence Dependency): Each entity in the entity set must participate in at least one relationship instance of that relationship set.
    • Represented by a double line between the entity set and relationship set in the ERD.
  • Partial Participation (Optional Participation): Each entity in the entity set may or may not participate in the relationship instance of the relationship set.
    • Represented by a single line between the entity set and relationship set in the ERD.

Example

  • A company is organized into departments.
  • Each department has a unique name, a unique number, and a particular employee who manages it.
  • A department may have several locations.

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Description

Test your knowledge on the evolution of databases, from flat file systems to modern cloud databases. This quiz will cover the various types of databases and their development over the decades. Suitable for anyone interested in data management and technology.

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