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Questions and Answers
What does DBMS stand for?
What is the primary function of a DBMS?
Which of the following is NOT a type of DBMS?
When was the first type of DBMS emerged?
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What is the name of the first DBMS model developed by IBM?
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What is the structure of Hierarchical DBMS based on?
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What is the main feature of Hierarchical Database Model?
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What is a Database Model?
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What is the primary purpose of creating a backup of data in a computer file-based system?
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What is the benefit of data independence in DBMS?
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What is the highest level of data abstraction in the ANSI/SPARC model?
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What is the purpose of a schema in a database?
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What is the main advantage of using a DBMS's backup and recovery sub-system?
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What is the term for the separation of data structure from the application program?
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What is the lowest level of abstraction in the ANSI/SPARC model?
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What is the term for the overall description of a database?
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What are the two fundamental concepts of the ER model?
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What is the ER-Diagram used for?
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What is the advantage of DBMS over earlier File Management System in terms of data?
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What is the term used to describe the accuracy and consistency of data stored in a database?
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What is the term used to describe the ability of multiple users to access the same data at the same time?
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What is the purpose of the ACID test in DBMS?
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What is the benefit of using DBMS over File Management System in terms of data sharing?
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What is the advantage of DBMS over earlier File Management System in terms of data consistency?
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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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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.