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Unit 1: Database System Architecture

20247m

Define a database and explain its importance in modern software systems.

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Database: Organized collection of related, integrated data stored to serve multiple applications with minimal redundancy, shared and managed by DBMS. Includes data plus metadata.

Importance in Modern Software Systems:

  • Centralized data management avoids duplication, ensures consistency
  • Efficient query processing (SQL, indexing) for applications (web, mobile,ERP)
  • Concurrency, transaction support (ACID) for multi-user systems like banking, e-commerce
  • Security, authorization, privacy for sensitive data
  • Scalability, handling big data, distributed access, cloud
  • Integration across microservices via single source of truth
  • Analytics, BI, ML pipelines depend on curated database
  • Recovery, durability prevents loss

Examples: E-commerce orders DB powers catalog/cart/payments; social network stores graphs; IoT sensor DB enables real-time monitoring. Without DBMS, file-based chaos, no integrity.

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