Database Systems
7 modules · 23 topics · 80 videos · 115 practice questions
Module 1
Module-1
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Three Schema architecture
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Dbms components
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Client server architecture
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DBMS vs File System: DBMS eliminates data redundancy, ensures data integrity, security, supports multiple users, backup & recovery, and efficient query processing, whereas file systems lack these features.
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Three-Schema Architecture: Comprises External (user views), Conceptual (community user view), and Internal (physical storage) levels with mappings ensuring data abstraction and independence.
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Data Independence: Logical independence allows changes in conceptual schema without affecting external views (harder to achieve); Physical independence allows changes in physical schema without impacting conceptual schema.
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DBA Role: Responsible for database setup, maintenance, security, backup/recovery, and query optimization knowledge even if not writing queries themselves.
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DBMS Components: Key modules include DDL compiler (processes schema definitions), DML compiler (processes data manipulation statements), Query compiler (analyzes and optimizes queries), Runtime processor (executes operations), and Stored Data Manager (handles storage).
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Real-World Design: DBMS architecture applied in systems like ticket booking and online course platforms using data abstraction and ensuring security, concurrency, and integrity.
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Schema vs State: Schema defines database structure; State represents current data in the database instance.
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User Types: Naive users, Application programmers, Sophisticated users (advanced querying), and DBAs, each interacting differently with the DBMS.