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Database Backup and Recovery
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Database Backup and Recovery

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Questions and Answers

What does DBMS stand for?

  • Data Bank Management System
  • Data Base Manager System
  • Data Base Management Software
  • Data Base Management System (correct)
  • What is the primary function of a DBMS?

  • To manage hardware
  • To manage software
  • To manage databases (correct)
  • To manage networks
  • Which of the following is NOT a type of DBMS?

  • Relational DBMS
  • Computer DBMS (correct)
  • Network DBMS
  • Hierarchical DBMS
  • When was the first type of DBMS emerged?

    <p>1960's-70's</p> Signup and view all the answers

    What is the name of the first DBMS model developed by IBM?

    <p>IMS</p> Signup and view all the answers

    What is the structure of Hierarchical DBMS based on?

    <p>Binary trees</p> Signup and view all the answers

    What is the main feature of Hierarchical Database Model?

    <p>Records are linked with other superior records on which they are dependent and also on the records, which are dependent on them</p> Signup and view all the answers

    What is a Database Model?

    <p>A logical structure of a database</p> Signup and view all the answers

    What is the primary purpose of creating a backup of data in a computer file-based system?

    <p>To protect valuable data from damage due to system failures</p> Signup and view all the answers

    What is the benefit of data independence in DBMS?

    <p>It enables changing the database structure without modifying the application program</p> Signup and view all the answers

    What is the highest level of data abstraction in the ANSI/SPARC model?

    <p>External view or User view</p> Signup and view all the answers

    What is the purpose of a schema in a database?

    <p>To design the overall structure of the database</p> Signup and view all the answers

    What is the main advantage of using a DBMS's backup and recovery sub-system?

    <p>It automates the backup process</p> Signup and view all the answers

    What is the term for the separation of data structure from the application program?

    <p>Data independence</p> Signup and view all the answers

    What is the lowest level of abstraction in the ANSI/SPARC model?

    <p>Internal view or Physical Level</p> Signup and view all the answers

    What is the term for the overall description of a database?

    <p>Database schema</p> Signup and view all the answers

    What are the two fundamental concepts of the ER model?

    <p>Entities and Relationships</p> Signup and view all the answers

    What is the ER-Diagram used for?

    <p>To represent data in a pictorial form</p> Signup and view all the answers

    What is the advantage of DBMS over earlier File Management System in terms of data?

    <p>Data redundancy and inconsistency are reduced</p> Signup and view all the answers

    What is the term used to describe the accuracy and consistency of data stored in a database?

    <p>Data Integrity</p> Signup and view all the answers

    What is the term used to describe the ability of multiple users to access the same data at the same time?

    <p>Concurrency</p> Signup and view all the answers

    What is the purpose of the ACID test in DBMS?

    <p>To manage transactions</p> Signup and view all the answers

    What is the benefit of using DBMS over File Management System in terms of data sharing?

    <p>Data can be shared by authorized users</p> Signup and view all the answers

    What is the advantage of DBMS over earlier File Management System in terms of data consistency?

    <p>Data consistency is ensured through ACID test</p> Signup and view all the answers

    Study Notes

    Backup and Recovery Procedures

    • Regular backup of data is essential to protect valuable data from damage due to system or application failures.
    • DBMSs provide automatic backup and recovery subsystems to create backups and restore data when needed.

    Data Independence

    • Data independence refers to the separation of data structure from application programs that use the data.
    • In DBMS, the structure of the database can be changed without modifying the application program.

    Database Architecture

    • The ANSI/SPARC model is a generalized architecture of DBMS, divided into three levels of abstraction:
      • External view or User view (highest level, relevant to users or application programs)
      • Conceptual view or Logical Level (includes all database entities and relationships)
      • Internal view or Physical Level (lowest level, closest to physical storage method)

    View Levels

    • Each user has a different external view, described by an external schema.
    • One conceptual view represents the entire database, called conceptual schema.
    • Internal schema describes how data is stored and accessed.

    Instances and Schemas

    • A schema defines the design of a database, similar to types and variables in programming languages.
    • The ER model is based on two concepts: entities (tables holding specific information) and relationships (associations between entities).

    Entity Relationship Diagram (ER-Diagram)

    • An ER-Diagram is a pictorial representation of data, describing how data is communicated and related to each other.
    • It can characterize entities, attributes, and relationships.

    Advantages of DBMS over File Management System

    • Reduced data redundancy and inconsistency
    • Data integrity through atomicity, consistency, isolation, and durability (ACID test)
    • Sharing of data among authorized users
    • Control over concurrency to prevent interference between users

    Introduction to DBMS

    • DBMS stands for Data Base Management System, a collection of interrelated data and programs to access data efficiently.
    • DBMS controls the organization, storage, retrieval, security, and integrity of data in a database.

    Database Models

    • A database model shows the logical structure of a database, including relationships and constraints.
    • Hierarchical Database model is one of the oldest database models, based on binary trees with parent-child record relationships.

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    Description

    This quiz covers the concepts of backup and recovery procedures in a computer file-based system, discussing the importance of data protection and the role of DBMSs in automating backup and recovery processes.

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