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Chapter 13: Distributed Databases Modern Database Management 6 th Edition Jeffrey A. Hoffer, Mary B. Prescott, Fred R. McFadden
Definitions ,[object Object],[object Object],They are NOT the same thing!
Reasons for Distributed Database ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Figure 13-1 -- Distributed database environments (adapted from Bell and Grimson, 1992)
Distributed Database Options ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Distributed Database Options ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Homogeneous, Non-Autonomous Database ,[object Object],[object Object],[object Object],[object Object],[object Object]
Figure 13-2 – Homogeneous Database Source : adapted from Bell and Grimson, 1992. Identical DBMSs
Typical Heterogeneous Environment ,[object Object],[object Object],[object Object],[object Object]
Figure 13-3 –Typical Heterogeneous Environment Source : adapted from Bell and Grimson, 1992. Non-identical DBMSs
Major Objectives ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Significant Trade-Offs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],NOTE: all this assumes replicated data (to be discussed later)
Advantages of Distributed Database over Centralized Databases ,[object Object],[object Object],[object Object],[object Object],[object Object]
Disadvantages of Distributed Database compared to Centralized databases ,[object Object],[object Object],[object Object],[object Object]
Options for Distributing a Database ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Data Replication ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Data Replication ,[object Object],[object Object],[object Object],[object Object],[object Object],Therefore, better when used for non-volatile (read-only) data
Types of Data Replication ,[object Object],[object Object],[object Object],[object Object]
Types of Push Replication ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Issues for Data Replication ,[object Object],[object Object],[object Object],[object Object],[object Object]
Horizontal Partitioning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Vertical Partitioning ,[object Object],[object Object]
Figure 13-6 Distributed processing system for a manufacturing company
Five Distributed Database Organizations ,[object Object],[object Object],[object Object],[object Object],[object Object]
Factors in Choice of Distributed Strategy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],See table 13-1
Table 13-1: Distributed Design Strategies
Distributed DBMS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Figure 13-10 – Distributed DBMS architecture
Local Transaction Steps ,[object Object],[object Object],[object Object],[object Object],[object Object]
Figure 13-10 – Distributed DBMS Architecture showing Local Transaction Steps Local transaction – all data stored locally 1 3 4 5 2
Global Transaction Steps ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Figure 13-10 – Distributed DBMS architecture showing global transaction steps Global transaction – some data is at remote site(s) 1 2 4 5 6 3 7 8
Distributed DBMS Transparency Objectives ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Two-Phase Commit ,[object Object],[object Object],[object Object],[object Object]
Two-Phase Commit ,[object Object],[object Object],[object Object]
Concurrency Control ,[object Object],[object Object],[object Object],[object Object],[object Object]
Query Optimization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Evolution of Distributed DBMS ,[object Object],[object Object],[object Object]
Evolution of Distributed DBMS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Distributed D B

  • 1. Chapter 13: Distributed Databases Modern Database Management 6 th Edition Jeffrey A. Hoffer, Mary B. Prescott, Fred R. McFadden
  • 2.
  • 3.
  • 4. Figure 13-1 -- Distributed database environments (adapted from Bell and Grimson, 1992)
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  • 6.
  • 7.
  • 8. Figure 13-2 – Homogeneous Database Source : adapted from Bell and Grimson, 1992. Identical DBMSs
  • 9.
  • 10. Figure 13-3 –Typical Heterogeneous Environment Source : adapted from Bell and Grimson, 1992. Non-identical DBMSs
  • 11.
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  • 23. Figure 13-6 Distributed processing system for a manufacturing company
  • 24.
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  • 26. Table 13-1: Distributed Design Strategies
  • 27.
  • 28. Figure 13-10 – Distributed DBMS architecture
  • 29.
  • 30. Figure 13-10 – Distributed DBMS Architecture showing Local Transaction Steps Local transaction – all data stored locally 1 3 4 5 2
  • 31.
  • 32. Figure 13-10 – Distributed DBMS architecture showing global transaction steps Global transaction – some data is at remote site(s) 1 2 4 5 6 3 7 8
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  • 39.