Question

A DBMS reduces data redundancy and inconsistency by

A) enforcing referential integrity.
B) uncoupling program and data.
C) utilizing a data dictionary.
D) minimizing isolated files with repeated data.

Answer 1

A DBMS reduces data redundancy and inconsistency through referential integrity, data dictionaries, and minimizing isolated files with repeated data.

Step-by-step explanation:

A DBMS (Database Management System) is a software that is used to store, manage, and retrieve data efficiently. It helps in reducing data redundancy and inconsistency through various techniques:

1. Enforcing referential integrity: This ensures that relationships between tables are maintained and that data inconsistencies are prevented. For example, in a relational database, if a foreign key is used to establish a relationship between two tables, the DBMS will prevent the insertion of data that violates this relationship.
2. Utilizing a data dictionary: A data dictionary contains metadata about the structure, organization, and constraints of the database. It helps ensure that all data elements are defined consistently and that any changes are reflected throughout the system.
3. Minimizing isolated files with repeated data: DBMS organizes data in a structured manner, eliminating the need for duplicate information stored in separate files. This reduces data redundancy and improves the efficiency of data storage and retrieval.