LIS 384K.11 Database-Management Principles and Applications

1. GSLIS - The University of Texas at Austin LIS 384K.11, Database-Management Principles and Applications LIS 384K.11Database-Management Principles and Applications Designing Distributed Databases (DDBs) R. E. Wyllys Last revised 2002 Apr 22

2. GSLIS - The University of Texas at Austin LIS 384K.11, Database-Management Principles and Applications Lesson Objectives You will Understand the principles underlying distributed databases (DDBs) in multi-user environments Understand the advantages and disadvantages of DDBs Understand the various ways in which databases can be distributed Become familiar with the "12 Rules for Databases" of C. J. Date

3. GSLIS - The University of Texas at Austin LIS 384K.11, Database-Management Principles and Applications Background of DDBs DDBs were first used in mainframe environments in the 1950s and 1960s. But they have flourished best since the development, in the 1980s and 1990s, of minicomputers and powerful desktop and workstation computers, along with fast, capacious telecommunications, has made it (relatively) easy and cheap to distribute computing facilities widely.

4. GSLIS - The University of Texas at Austin LIS 384K.11, Database-Management Principles and Applications Date's 12 Rules for DDBs 1. Local site independence 2. Central site independence 3. Failure independence 4. Location transparency 5. Fragmentation transparency 6. Replication transparency 7. Distributed query processing 8. Distributed transaction processing 9. Hardware independence 10. Operating system independence 11. Network independence 12. Database independence