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Ch 8 Client Server

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The Client/Server Database Environment Modern Database Management Jeffrey A. Hoffer, Mary B. Prescott, Fred R. McFadden
Client/Server Systems ,[object Object],[object Object],[object Object],[object Object],[object Object]
Application Logic in C/S Systems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],GUI Interface Procedures, functions, programs DBMS activities
Client/Server Architectures ,[object Object],[object Object],[object Object],Client does extensive processing Client does little processing
File Server Architecture ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],FAT CLIENT
Figure 9-2 – File Server Architecture FAT CLIENT
Database Server Architectures ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Advantages of Stored Procedures ,[object Object],[object Object],[object Object],[object Object],[object Object]
Figure 9-3 – Database server architecture Thinner clients DBMS only on server
Three-Tier Architectures ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],GUI interface (I/O processing) Browser Business rules Web Server Data storage DBMS
Figure 9-4 -- Three-tier architecture Thinnest clients Business rules on separate server DBMS only on DB server
Advantages of Three-Tier Architectures ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Challenges of Three-tier Architectures ,[object Object],[object Object],[object Object],[object Object],[object Object]
Application Partitioning ,[object Object],[object Object],[object Object],[object Object],[object Object]
Processing Logic Distributions 2-tier distributions n -tier distributions Processing logic could be at client, server, or both Processing logic will be at application server or Web server
Parallel Computer Architectures ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Parallel Computer Architectures Figure 9-6 – Tightly-coupled – CPUs share common memory space Figure 9-7 – Loosely-coupled – CPUs each have their own memory space
Query Processing with Parallel Processors Figure 9-5(a) – Parallel transactions Figure 9-5(b) – Parallel query
Middleware ,[object Object],[object Object],[object Object],The “glue” that holds client/server applications together
Types of Middleware ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Database Middleware ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Client/Server Security ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Query-by-Example (QBE) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Figure 9-10: QBE view of a 2-table join query Figure 9-12: Equivalent query in SQL
Figure 9-9: Access usability hierarchy Foundation of MS Access Simple processes Stored modules of pre-existing VBA code Visual Basic for Applications…language for customizing the application API to call functions in DLLs external to MS Access
Using ODBC to Link External Databases Stored on a Database Server ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Java Database Connectivity (JDBC) is similar to ODBC – built specifically for Java applications
ODBC Architecture (Figure 9-18) Each DBMS has its own ODBC-compliant driver Client does not need to know anything about the DBMS Application Program Interface (API) provides common interface to all DBMSs
Visual Basic for Applications ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Ch 8 Client Server

  • 1. The Client/Server Database Environment Modern Database Management Jeffrey A. Hoffer, Mary B. Prescott, Fred R. McFadden
  • 2.
  • 3.
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  • 6. Figure 9-2 – File Server Architecture FAT CLIENT
  • 7.
  • 8.
  • 9. Figure 9-3 – Database server architecture Thinner clients DBMS only on server
  • 10.
  • 11. Figure 9-4 -- Three-tier architecture Thinnest clients Business rules on separate server DBMS only on DB server
  • 12.
  • 13.
  • 14.
  • 15. Processing Logic Distributions 2-tier distributions n -tier distributions Processing logic could be at client, server, or both Processing logic will be at application server or Web server
  • 16.
  • 17. Parallel Computer Architectures Figure 9-6 – Tightly-coupled – CPUs share common memory space Figure 9-7 – Loosely-coupled – CPUs each have their own memory space
  • 18. Query Processing with Parallel Processors Figure 9-5(a) – Parallel transactions Figure 9-5(b) – Parallel query
  • 19.
  • 20.
  • 21.
  • 22.
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  • 24. Figure 9-10: QBE view of a 2-table join query Figure 9-12: Equivalent query in SQL
  • 25. Figure 9-9: Access usability hierarchy Foundation of MS Access Simple processes Stored modules of pre-existing VBA code Visual Basic for Applications…language for customizing the application API to call functions in DLLs external to MS Access
  • 26.
  • 27. ODBC Architecture (Figure 9-18) Each DBMS has its own ODBC-compliant driver Client does not need to know anything about the DBMS Application Program Interface (API) provides common interface to all DBMSs
  • 28.