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Donald K. Burleson

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Oracle and Disk Usage

Some applications will do fine with two disks or volumes. This setup is not great, mind you, but the system will function. Other applications, such as large complex systems involving numerous indexes, data tables, and tablespaces, may require dozens. To reduce disk contention and maximize database reliability, it is suggested that the DBA utilize OFA procedures to place database files. The next subsections cover file placement for some basic disk array layouts.

One Area (Surely You Jest) 

It is foolish and very dangerous to even consider using a single area to hold all Oracle files for other than DOS, OS/2, WINDOWS NT, or MAC-based single-user databases. Unless you have the latest and greatest EMC array with multiple gigs of storage, hot replacement of disks, and RAID5, a single large area can lead to problems. A single disk failure or crash in a stripe set could completely destroy your system. Since there are no file placement options with one area, let’s go on to the next configuration.

Two Areas (Just Barely Adequate) 

At least with two areas you can achieve separation of data and indexes and can separate redo logs from archive log files. This gives you some redundancies in recovery options. The file placement is shown here.

AREA1. Oracle executables, index datafiles, redo logs, export files, a copy of the control file
AREA2. Data-datafiles, rollback segment datafile, temporary user datafiles, archive log files, a copy of the control file
 

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.

 

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