Essentials of MIS (12th Edition)
12th Edition
ISBN: 9780134238241
Author: Kenneth C. Laudon, Jane P. Laudon
Publisher: PEARSON
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Chapter 6, Problem 2RQ
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DBMS (
DBMS is a program or software that is used to control and manage the database. It is a large, complex program or software that is used to manage and administer the stored databases and it is a computer based system to keep records.
Query language such as SQL is used along with DBMS to interact with the database.
Work of a DBMS:
- DBMS is used to Create Database which enables the user to store or contain a large amount of data.
- DBMS is used to manage the data definitions in database dictionary.
- DBMS provides security to the user by having network security such as firewalls which monitors internet traffic and using an Intrusion Detection System (IDS) device that blocks unauthorized access.
- The database can be accessed by more than one user simultaneously.
- DBMS is used for creating and managing structures to store the large volume of data.
- Data safety and integrity is preserved by DBMS as it provides backup and recovery.
- Data presented in database can be modified (alter, delete) using DBMS.
- DBMS is used to create indexes which act as a supporting structure for speedy retrieval of queries.
- DBMS decreases data redundancy and increases data consistency which maintains integrity rules.
Benefits of DBMS in organizations:
- The DBMS makes it probable to give rapid answers to ad-hoc queries.
- It gives better data integration for the organization operations.
- It offers a framework for better enforcement of data privacy and security policies.
Difference between logical and physical views of data:
| Logical view | Physical view |
| The logical view of a database program represents data in a format. | The physical view deals with the physical arrangement, actual arrangement and location of data in the direct access storage devices. |
| The logical view presents data as end users would observe them. | The user uses the physical view to create effective use of storage and processing resources. |
| Database contains many logical views. | Database contains only one physical view. |
| It refers to the way user views data | It refers to the way the data are physically stored and processed. |
Three operations of a RDBMS:
Three operations are used to develop useful sets of data in the RDBMS...
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