Donald K. Burleson
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.
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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