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Chapter 3 - OFA. Database Processing. Chapter 3. Logical Database Layouts. Chapter 3 - OFA. Optimal Flexible Architecture. image source: http://www.iprimus.ca/~mariolam/flexibility.html. Chapter 3 - OFA. OFA. - PowerPoint PPT Presentation
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Chapter 3
Logical Database Layouts
Database Processing Chapter 3 - OFA
Copyright © 2001 Harold Pardue, University of South Alabama Chapter 3 - Logical Database Layouts
Optimal Flexible Architecture
image source: http://www.iprimus.ca/~mariolam/flexibility.html
Chapter 3 - OFA
Copyright © 2001 Harold Pardue, University of South Alabama Chapter 3 - Logical Database Layouts
OFA
• The OFA standard is a set of configuration guidelines for fast, reliable Oracle databases that require little maintenance.
• At the highest level, it is designed to logically separate objects by object type and activity type.
• It is the structure you get if you create a default database
Chapter 3 - OFA
Copyright © 2001 Harold Pardue, University of South Alabama Chapter 3 - Logical Database Layouts
System tablespace
• At a minimum you have to have a SYSTEM tablespace
• It would be a very poor design to put all objects into one tablespace.– Data dictionary should be isolated
Chapter 3 - OFA
Copyright © 2001 Harold Pardue, University of South Alabama Chapter 3 - Logical Database Layouts
Data tablespaces
• Our author suggests that data tablespaces should be organized by application
• The data for each application should isolated from the system tables and other tablespaces– For example, human resources, accounting,
sales, inventory management– One database, many applications
Chapter 3 - OFA
Copyright © 2001 Harold Pardue, University of South Alabama Chapter 3 - Logical Database Layouts
Index tablespaces
• Because of concurrent I/O, indexes should be stored separately from their associated tables.
• In my installation, my assumption was that the indexes would be in the indx01.dbf file
• I queried the dba_indexes view and found...
Chapter 3 - OFA
Copyright © 2001 Harold Pardue, University of South Alabama Chapter 3 - Logical Database Layouts
Index tablespaces Chapter 3 - OFA
Primary Key indexes in User tablespace
Copyright © 2001 Harold Pardue, University of South Alabama Chapter 3 - Logical Database Layouts
Index tablespaces Chapter 3 - OFA
USER tablespace is in the USERS01.DBF file.
Copyright © 2001 Harold Pardue, University of South Alabama Chapter 3 - Logical Database Layouts
Index tablespaces Chapter 3 - OFA
So I moved it...
Copyright © 2001 Harold Pardue, University of South Alabama Chapter 3 - Logical Database Layouts
Index tablespaces Chapter 3 - OFA
And now it’s in the index data file
Copyright © 2001 Harold Pardue, University of South Alabama Chapter 3 - Logical Database Layouts
Tools tablespaces
• Used to store tables created by Oracle or 3rd party tools (applications) that create tables owned by the SYSTEM account
Chapter 3 - OFA
Copyright © 2001 Harold Pardue, University of South Alabama Chapter 3 - Logical Database Layouts
User tablespaces
• For development projects• All other tables should be created by
the DBA
Chapter 3 - OFA
Copyright © 2001 Harold Pardue, University of South Alabama Chapter 3 - Logical Database Layouts
Other tablespaces
• RBS• Temp
Chapter 3 - OFA
Copyright © 2001 Harold Pardue, University of South Alabama Chapter 3 - Logical Database Layouts
OFA
• Further divide the previous tablespaces into pairs of high/low usage tablespaces
• Common-sense Logical Layouts– Segment types that are used in the same
way should be stored together– The system should be designed for standard
usage– Separate areas should exist for exceptions– Contention among tablespaces should be
minimized– The data dictionary should be isolated
Chapter 3 - OFA
