Database Application Application logic: presentation (input /output)

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Presentation transcript:

Database Application Application logic: presentation (input /output) processing logic data processing (data validation, error identification) business rules (those not enforced by DBMS) data management (identify data for query/transaction, DMBS-level) storage logic data storage and retrieval

Client-Server Architecture Types of architecture: File Server Two-tier architecture Three-tier architecture differ in how the application logic is distributed between different components (client, server)

Fat Client

Thinner Client DBMS only on server

Thinnest Clients DBMS only on the DB server Business logic on a separate server

Client does not need to know anything about the DBMS Open Database Connectivity (ODBC) Architecture Client does not need to know anything about the DBMS Each DBMS has its own ODBC-compliant driver

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