Database Processing and DBMS Functions
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Questions and Answers

What is a database system?

  • A single component used to store data
  • A system used to process data only
  • A collection of interrelated components used to store data (correct)
  • A collection of unrelated components used to store data

    • What is the primary function of metadata in a database system?

  • To define the relationships between data
  • To define and describe the extent, type, structure, and format of data (correct)
  • To store data about the database system
  • To provide concurrent access to the database

    • What is an example of a database system?

  • A hotel or airline reservation system (correct)
  • A system used to watch movies
  • A manual calculation system
  • A system used to play games

    • What is a problem with manual file systems?

    <p>Data duplication and inconsistency (C)</p> Signup and view all the answers

    Which of the following is a characteristic of a database system that ensures data reliability?

    <p>Data integrity (A)</p> Signup and view all the answers

    What is another problem with manual file systems?

    <p>Integrity problems, hard to add, update or delete records (B)</p> Signup and view all the answers

    What is the primary purpose of ACID properties in a database system?

    <p>To maintain accuracy, completeness, isolation, and durability (C)</p> Signup and view all the answers

    What is the benefit of insulation between data and program in a database system?

    <p>It allows for changes in the data without affecting the application software (A)</p> Signup and view all the answers

    What is a characteristic of a database system?

    <p>A high-level definition of the structured and relationship between stored data (D)</p> Signup and view all the answers

    What is a disadvantage of manual file systems?

    <p>Difficulty in accessing data (C)</p> Signup and view all the answers

    What is the primary purpose of transactions in a database system?

    <p>To ensure that transactions are either completed or uncompleted (B)</p> Signup and view all the answers

    What is a problem with manual file systems in terms of data?

    <p>Data duplication leads to inconsistency (C)</p> Signup and view all the answers

    What is the benefit of providing multiple views of the database to users?

    <p>It enables users to access the database based on their department and interest (D)</p> Signup and view all the answers

    What is another problem with manual file systems?

    <p>Uncontrolled concurrent access by multiple users (C)</p> Signup and view all the answers

    What is the primary purpose of data persistency in a database system?

    <p>To ensure that data is not lost in case of system failure (D)</p> Signup and view all the answers

    What is the primary purpose of security in a database system?

    <p>To provide different rights to access the database (D)</p> Signup and view all the answers

    What is one of the main functions of a DBMS?

    <p>Defining a database (B)</p> Signup and view all the answers

    What is one of the advantages of using a DBMS?

    <p>Improving data consistency (A)</p> Signup and view all the answers

    What is a characteristic of a database system?

    <p>All of the above (D)</p> Signup and view all the answers

    What type of DBMS is used by multiple users?

    <p>Multi-user System (D)</p> Signup and view all the answers

    What is one of the disadvantages of using a DBMS?

    <p>Complexity (D)</p> Signup and view all the answers

    What is the role of a Database Administrator?

    <p>Administering the resources such as database, DBMS and related software (B)</p> Signup and view all the answers

    What is one of the functions of a DBMS in protecting the database?

    <p>System protection against hardware or software malfunction (D)</p> Signup and view all the answers

    What is one of the classification of DBMS according to the data model?

    <p>Relational Model (A)</p> Signup and view all the answers

    What is one of the functions of a DBMS in manipulating a database?

    <p>Querying the database to retrieve specific data (A)</p> Signup and view all the answers

    What is the role of a System Analyst?

    <p>Developing specifications for end users (B)</p> Signup and view all the answers

    Study Notes

    Database Processing

    • DBMS provides a set of functions to manage data, including:
      • Insert
      • Update
      • Delete
      • Search/View

    Functions of DBMS

    • Defining a database:
      • Specifying data types, structures, and constraints
      • Constructing the database
    • Manipulating a database:
      • Querying the database to retrieve specific data
      • Updating the database to reflect changes
      • Generating reports from the data
    • Sharing a database:
      • Allowing multiple users to access the database
    • Protecting the database:
      • System protection against hardware or software malfunction
      • Security protection against unauthorized or malicious access
    • Maintaining the database system:
      • Evolving the system as requirements change over time

    Database Users

    • Database Administrators:
      • Administering resources such as database, DBMS, and related software
    • Database Designers:
      • Identifying data to be stored in the database
      • Choosing appropriate structures to represent and store data
    • End users:
      • Accessing the database for querying, updating, and generating reports
    • System Analysts and Application Programmers (Software Engineers):
      • Determining the requirements of end users and developing specifications
      • Implementing these specifications as programs

    Advantages of DBMS

    • Controlling redundancy
    • Improving data consistency
    • Restricting unauthorized access
    • Sharing of data
    • Providing multiple user interfaces
    • Representing complex relationships among data
    • Enforcing standards and integrity constraints
    • Providing backup and recovery
    • Increasing concurrency

    Disadvantages of DBMS

    • Complexity
    • Cost of DBMS
    • Additional hardware costs
    • Cost of conversion
    • Performance
    • Higher impact of failures

    Classification of DBMS

    • According to the data model:
      • Relational Model
      • Network Model
      • Hierarchical Model
      • Object Data Model
      • Object-relational Model
    • According to the number of users:
      • Single user Systems
      • Multi-user Systems
    • According to the distribution:
      • Centralized DBMS
      • Distributed DBMS

    Characteristics of Database System

    • Real World Entity:
      • Using real-world entities to design databases
    • Self-Describing Nature:
      • A DBMS should be self-describing, containing the database and metadata
    • Support ACID Properties:
      • Accuracy, Completeness, Isolation, and Durability
    • Concurrent Use of Database:
      • Multiple users can access the data at the same time
    • Insulation Between Data and Program:
      • Changes in data do not affect application software
    • Transactions:
      • Only completed or uncompleted
    • Data Persistency:
      • Data is protected from system failure
    • Backup and Recovery:
      • Enables more effectiveness
    • Data integrity:
      • Protects unauthorized access and ensures data quality
    • Multiple Views:
      • Users can have multiple views of the database depending on their department and interest
    • Store any kind of data:
      • Any kind of data can be stored in DBMS
    • Security:
      • Provides different rights to access the database
    • Represent complex relationships between data:
      • Able to represent complex relationships between data for efficient and accurate use

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    Description

    Learn about the functions of a Database Management System (DBMS) including defining, constructing, and managing a database. Understand the different operations that can be performed on a database.

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