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Donald K. Burleson

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Oracle Executables

The Oracle executables are the heart of the system. Without the executables the system is of course worthless since the datafiles are only readable by Oracle processes. The Oracle executables should be on a disk reserved for executables. Disk speed is not a big issue, but availability is a major concern. The executables will require 3 to 4 GB or more of disk space up to three times this for an Oracle applications installation. The installation process will create a directory structure starting at a user-specified ORACLE_BASE directory. There will usually be a subdirectory for each major product installed. If you are looking at Oracle applications such as financials, CRM, or ERM, then this structure could be extremely complex.

Oracle Datafiles

Datafiles are the physical implementations of Oracle tablespaces. Tablespaces are the logical units of storage (containers) that would roughly compare to volume groups in an operating system. Each tablespace can have hundreds of tables, indexes, rollback segments, constraints, and other internal structures mapped into it. In return, these are then mapped into the datafiles that correspond to the tablespaces. Only a limited number of datafiles can be associated with a tablespace. The total number of datafiles for the entire database is set by the MAXDATAFILES parameter at creation.
 

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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