PyQdeck LogoPyQdeckSubjectsSyllabusBlog
Back to the 2024 paper

Unit 1: Database System Architecture

20247m

Explain three levels of data abstraction.

Search GoogleAsk AI
Worked SolutionAI Assisted

Three Levels of Data Abstraction:

  1. Physical Level: Lowest - how data stored physically - files, blocks, indexes, hashing, compression. Hidden from users.

  2. Logical/Conceptual Level: What data stored, relationships, constraints, semantics. DBA defines schema, e.g., tables Student(id, name). Provides logical independence.

  3. View/External Level: User-specific views - subset of logical level, hides irrelevant data, provides security. Example: Faculty view shows student grades, Student view hides.

Benefits: Data abstraction achieves independence - physical changes without affecting logical, logical changes without affecting views - easing application development, security.

Similar questions

Database Management SystemThe different levels of data abstraction are: (i) Physical level (ii) Logical level (iii) View level (iv) all of the above20222mDatabase Management SystemExplain the three-level database architecture with a neat diagram. How does it support data abstraction and data independence?20257mDATABASE MANAGEMENT SYSTEMDraw and explain three level architecture of database system.20247mDatabase Management SystemDraw and explain the three-level architecture of the database system.20197m
PreviousIllustrate disadvantages of file processing systems.NextFind the highest normal form of a relation R(ABCD) with FD set (B→A, A→C, BC→D, AC→BE).
Budget AppAndroid App

Pocketly on Android

Log daily food, travel, and hostel expenses instantly. Set monthly spending limits and see where your money goes without complex spreadsheets.

Install Pocketly