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Questions and Answers
What are the functions of DBMS?
What are the functions of DBMS?
- Data transmission & reception
- Data deletion, modification & retrieval
- Data encryption & decryption
- Data storage, access & update (correct)
What does DDL stand for in the context of databases?
What does DDL stand for in the context of databases?
- Data Description Log
- Database Design Logic
- Data Definition Language (correct)
- Data Deletion Log
Which model describes the logical structure of a database?
Which model describes the logical structure of a database?
- Object-oriented model
- Network data model
- Relational data model (correct)
- Hierarchy data model
What does DML primarily deal with in a database?
What does DML primarily deal with in a database?
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What is the purpose of data encryption techniques in databases?
What is the purpose of data encryption techniques in databases?
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Study Notes
Functions of DBMS
- A DBMS (Database Management System) performs several functions, including defining, constructing, and manipulating databases
- It also controls access, manages concurrency, and ensures database security and integrity
- DBMS provides a way to store, retrieve, and manipulate data in a database
DDL (Data Definition Language)
- DDL is used to define the structure and organization of a database
- It is used to create, modify, and delete database objects such as tables, indexes, and relationships
Logical Structure of a Database
- The logical structure of a database is described by the relational model
- This model organizes data into one or more tables with rows and columns
- Each table has a unique name and consists of rows (also called tuples) and columns (also called attributes)
DML (Data Manipulation Language)
- DML primarily deals with managing data in a database
- It includes commands such as SELECT, INSERT, UPDATE, and DELETE
- These commands are used to retrieve, add, modify, and delete data in a database
Data Encryption Techniques
- Data encryption techniques are used to protect data from unauthorized access
- These techniques convert plaintext data into unreadable ciphertext to prevent hackers from accessing sensitive information
- The purpose of data encryption is to ensure data confidentiality, integrity, and authenticity
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