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Donald K. Burleson

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Oracle and Disk Usage

AREA3. Index datafiles, a copy of the control file, redo logs
AREA4. Rollback segment datafiles, export files
AREA5. Archive log files
AREA6. Temporary areas, export files

Seven Areas (Oracle Nirvana)

With seven areas we have minimum contention; and by moving export files to tape, we can eliminate one additional source of database lockup.
AREA1. Executables, a copy of the control file, redo logs, the SYSTEM tablespace datafiles
AREA2. Data-datafiles, a copy of the control file, redo logs
AREA3. Index datafiles, a copy of the control file, redo logs
AREA4. Rollback segment datafiles, export files
AREA5. Archive log files
AREA6. Temporary areas, export files
AREA7. Backup staging area

By monitoring AREA5 and periodically removing archive log files to tape we can eliminate another. If we really wanted to push OFA, we could add a couple of areas for redo logs. Of course, if you use the partitioning options of Oracle, then you may need many more areas in order to place the partitions in separate areas.

Other authors recommend larger configurations, and in some cases they are warranted. If you have several large tables, consider placing these, and their indexes, in separate areas. Most of this type of consideration is application-dependent. With some of the giant databases we are now seeing (hundreds of gigabytes aren’t uncommon anymore) and with petabyte sizes now available through the latest releases of Oracle, it seems silly to talk about a mere 5, 7, or 100 disks. If you can use RAID0/1 and stripe data across multiple platters, do it. Of course, don’t do what one inexperienced system administrator did: try to do RAID5 sets with two disks each.
 

This is an excerpt by Mike Ault’s book “Oracle Administration & Management”.  If you want more current Oracle tips by Mike Ault, check out his new book “Mike Ault’s Oracle Internals Monitoring & Tuning Scripts” or Ault’s Oracle Scripts Download.

 

 ”call

  
 

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