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?

1960's-70's (B) Signup and view all the answers

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

IMS (B) Signup and view all the answers

What is the structure of Hierarchical DBMS based on?

Binary trees (D) Signup and view all the answers

What is the main feature of Hierarchical Database Model?

Records are linked with other superior records on which they are dependent and also on the records, which are dependent on them (A) Signup and view all the answers

What is a Database Model?

A logical structure of a database (A) Signup and view all the answers

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

To protect valuable data from damage due to system failures (C) Signup and view all the answers

What is the benefit of data independence in DBMS?

It enables changing the database structure without modifying the application program (D) Signup and view all the answers

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

External view or User view (B) Signup and view all the answers

What is the purpose of a schema in a database?

To design the overall structure of the database (C) Signup and view all the answers

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

It automates the backup process (D) Signup and view all the answers

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

Data independence (B) Signup and view all the answers

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

Internal view or Physical Level (B) Signup and view all the answers

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

Database schema (A) Signup and view all the answers

What are the two fundamental concepts of the ER model?

Entities and Relationships (C) Signup and view all the answers

What is the ER-Diagram used for?

To represent data in a pictorial form (D) Signup and view all the answers

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

Data redundancy and inconsistency are reduced (A) Signup and view all the answers

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

Data Integrity (D) 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?

Concurrency (D) Signup and view all the answers

What is the purpose of the ACID test in DBMS?

To manage transactions (B) Signup and view all the answers

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

Data can be shared by authorized users (C) Signup and view all the answers

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

Data consistency is ensured through ACID test (B) Signup and view all the answers

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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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