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Database Architectures and Implementations

Database Architectures and Implementations. We shape our buildings: thereafter they shape us Winston Churchill. Database Architectures and Implementations. An architecture should Respond to queries in a timely manner Minimize the cost of processing data Minimize the cost of storing data

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Database Architectures and Implementations

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  1. Database Architectures and Implementations We shape our buildings: thereafter they shape us Winston Churchill

  2. Database Architectures and Implementations • An architecture should • Respond to queries in a timely manner • Minimize the cost of processing data • Minimize the cost of storing data • Minimize the cost of data delivery • These objectives can be conflicting

  3. No-schema architecture

  4. One-schema architecture

  5. Two-schema architecture

  6. ANSI SPARC • A 1972 committee to examine standardization of database technology • Focused on the interfaces • Internal • Conceptual • External

  7. External • The clients’ views of the system • There can be multiple views

  8. Conceptual • The database designer’s view • The data model • Includes all files and all fields within files • Should be unconstrained by consideration of storage structures and data access mechanisms • Can include security and integrity considerations

  9. Internal • The lowest level • Considers data storage and access • Includes indexing and record sequencing

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