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ch5-p1 - Distributed Database Systems Chapter 5 Chapter 5...

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Distributed Database Systems Chapter 5 Chapter 5 Distributed Database Design DDB design --making decision on the placement of data across the network 51 Alternative Design Strategies 5.11 Top-down design process An iteration of five steps: 1. Requirement analysis 2. Conceptual design and view integration E-R representation and translation to RDB schema 3. Distribution design Data fragmentation and allocation 4. Physical design 1
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Distributed Database Systems Chapter 5 5. Tuning 2
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Requirements Analysis System Requirements (Objectives) User input Conceptual Design View Design View Integration Access Information Global Conceptual Schema External Schema Definitions User Input Distribution Design Local Conceptual Schema Physical Design Schema Feedback Feedback Observation and Monitoring Distributed Database Systems Chapter 5 3
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Distributed Database Systems Chapter 5 5.1.2 Bottom-up design process Primarily for multidatabase applications 52 Distribution design issues l Why to fragment l How to fragment l Correctness of fragmentation l How to allocate l The information for fragmentation 5.21 Reasons for fragmentation To enhance intraquery concurrency To increase the throughput But extra cost for queries involving more than one segment residing at different sites 5.22 Fragmentation Alternatives 4
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Distributed Database Systems Chapter 5 Horizontal, or vertical, or both. 5
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Distributed Database Systems Chapter 5 E ENO ENAME TITLE E1 J.Doe Elec. Eng. E2 M.Smith Syst. Anal. E3 A.Lee Mach. Eng. E4 J.Miller Programmer E5 B.Casey Syst. Anal. E6 L.Chu Elec. Eng.
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