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Learn about the ANSI/SPARC 3-level DBMS model and the concept of data independence in this Database Architecture Lecture. Covers logical and physical data independence, external and internal schemas, and various data models.

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Announcements

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  1. Announcements • No Class Friday • Homework 1 - Due now • Project: Step 1 Due 9/17 • Reading for Monday • 2.6 – 2.8 • Homework 2 - Due 9/22

  2. Database Architecture Lecture 4

  3. ANSI/SPARC 3-level DBMS Model External Schemas logical data independence Logical Schema physical data independence Internal Schema …

  4. Rationale for separation of external and internal levels

  5. Data Independence • Logical data independence • Physical data independence

  6. Object-based data models Entity-Relationship Object-Oriented Object-Relational Record-based data models Relational Network Hierarchical Data Models

  7. Entity-Relationship Model

  8. Relational Model

  9. Object-oriented Model

  10. Object-relational model

  11. Semi-structured Model

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