Chapters 17 & 18 Physical Database Design Methodology

Agenda Physical database design Mapping Logical Design to DBMS Balancing the flexibility and performance Monitoring and Tuning DBMS

Physical Database Design Implementing a database using specific data storage structures and access methods

Mapping Logical Design to DBMS -I Create base relations –Name –Attributes –Primary key –Foreign key –Alternative key –Indexes Implement integrity rules –Domain –Enterprise –Referential (no action, cascade, set null, set default, and no check for deleting and updating) –Entity

Mapping Logical Design to DBMS -II Design representation of derived data Analysis transactions for file organizations and indexes Estimate disk space requirements Design user views Design security –System –Data

Balancing Flexibility and Performance Denormalization –Low update rate –High query rate –Cross-referencing transactions and relations table Steps –Derived data –Redundancy

Monitoring and Tuning DBMS Correct inappropriate design Implement new minor requirement Produce better Response time and throughput Increase user’s satisfaction

Points To Remember Physical database design Mapping Logical Design to DBMS Balancing the flexibility and performance Monitoring and Tuning DBMS

Assignment Review chapters 5-6 and11-18 Read chapters Project (enhanced e-r & normalization) –Due date: