Veritas Storage Foundation™ for Oracle 5.0.1 Administrator's Guide

I/O and direct I/O to and from the disk device, as well as bypassing the UNIX
single-writer lock behavior for most file system files.
Quick I/O file A regular UNIX file that is accessed using the Quick I/O naming extension
(::cdev:vxfs:).
RAID A Redundant Array of Independent Disks (RAID) is a disk array set up with part
of the combined storage capacity used for storing duplicate information about
the data stored in that array. This makes it possible to regenerate the data if a
disk failure occurs.
recovery mode The process of recovering the file systems once the file systems have been restored.
In a media failure scenario, the backups must be restored before the database can
be recovered.
redo log files Redo log files record transactions pending on a database. If a failure prevents data
from being permanently written to datafiles, changes can be obtained from the
redo log files. Every Oracle database has a set of two or more redo log files.
repository A repository holds the name, type, range of values, source, and authorization for
access for each data element in a database. The database maintains a repository
for administrative and reporting use.
Pertinent information, needed to display configuration information and interact
with the database, is stored in the repository.
root disk The disk containing the root file system.
root disk group A special private disk group on the system. The root disk group is named rootdg.
However, starting with the 4.1 release of Veritas Volume Manager, the root disk
group is no longer needed.
root file system The initial file system mounted as part of the UNIX kernel startup sequence.
script A file, containing one or more commands that can be run to perform processing.
shared disk group A disk group in which the disks are shared by multiple hosts (also referred to as
a cluster-shareable disk group).
sector A minimal unit of the disk partitioning. The size of a sector can vary between
systems.
A sector is commonly 1024 bytes.
segment Any partition, reserved area, partial component, or piece of a larger structure.
SGA See "System Global Area."
single threading The processing of one transaction to completion before starting the next.
slave node A node that is not designated as a master node.
snapped file system A file system whose exact image has been used to create a snapshot file system.
Glossary408