Database Management System · Unit 2 · 3 hrs
Database System – Concepts and Architecture
Exam-focused notes for Database System – Concepts and Architecture (Database Management System, CSC265): what the TU syllabus asks and how it has actually been tested, with 6 solved past questions from this unit.
What this unit covers
- Data Models, Schemas, and Instances
- Three-Schema Architecture and Data Independence
- Database Languages and Interfaces
- the Database System Environment
- Centralized and Client/Server Architectures for DBMSs
- Classification of Database Management Systems
Data Models, Schemas, and Instances
Define data abstraction, data model, schemas, instances and database state. [5]
--- Data abstraction refers to the process of hiding the complexity of the internal details of how data is stored and maintained, and exposing only the relevant information to the users. A database system achieves this through three levels of abstraction: -...
Full solved answer →What do you mean by Schema and Instance in DBMS? Explain both with examples. [5]
The overall design of the database is called the database schema. It describes the structure, organization, and constraints of the database. The schema is defined at the time the database is designed and does not change frequently. According to the level of...
Full solved answer →Three-Schema Architecture and Data Independence
What is Database Management System? Explain the DBMS architecture with a diagram. What is data independence?[10]
--- A Database Management System (DBMS) is a collection of the database, its processing methods, and the set of rules and conditions to be followed for managing data. It is the way to store data and also provides a mechanism for manipulation of data. It is ...
Full solved answer →What is difference between logical data independence and physical data independence? [5]
The capacity to change the schema at one level of a database system without having to change the schema at the next higher level is called data independence. It is one of the major advantages of using a DBMS and is directly related to the three-schema archi...
Full solved answer →What is data abstraction? What are three levels of data abstraction? Explain. [5]
Data abstraction refers to the hiding mechanism of details of data organization and storage, while highlighting the essential features for an improved understanding of data. It allows users to interact with the database without needing to know how data is p...
Full solved answer →Define data independence. Explain three-schema architecture. [5]
--- Data independence is the capacity to change the schema at one level of a database system without having to change the schema at the next higher level. There are two types of data independence: It is the capacity to change the conceptual schema without h...
Full solved answer →Make Unit 2 stick
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