Distributed Database Design

Jun 29th, 2015
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Texas Woman's University
Course: general
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If the relation is replicated, we get unnecessary replications, which cause problems in executing updates and waste disk space Might be an Ok solution, if queries need all the data in the relation and data stays at the only sites that uses the data.

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Chapter 3: Distributed Database Design- Design problem- Design strategies(top-down, bottom-up)- Fragmentation- Allocation and replication of fragments, optimality, heuristicsAcknowledgements: I am indebted to Arturas Mazeika for providing me his slides of this course.DDB 2008/09J. GamperPage 1Design Problem- Design problem of distributed systems: Making decisions about the placement ofdata and programs across the sites of a computer network as well as possibly designing the network itself.- In DDBMS, the distribution of applications involves- Distribution of the DDBMS software- Distribution of applications that run on the database- Distribution of applications will not be considered in the following; instead the distribution of data is studied.DDB 2008/09J. GamperPage 2Framework of Distribution- Dimension for the analysis of distributed systems- Level of sharing: no sharing, data sharing, data + program sharing- Behavior of access patterns: static, dynamic- Level of knowledge on access pattern behavior: no information, partial information, complete information- Distributed database design should be considered within this general framework.DDB 2008/09J. GamperPage 3Design Strategies- Top-down approach- Designing systems from scratch- Homogeneous systems- Bottom-up approach- The databases already exist at a number of s

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