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G-31
Glossary
standalone and SCSI library devices can
be used for offline recovery. Recovery
of the Cell Manager is always offline.
offline redo log
See archived redo log
On-Bar (Informix Server specific term)
A backup and restore system for
Informix Server. ON-Bar enables you to
create a copy of your Informix Server
data and later restore the data. The ON-
Bar backup and restore system involves
the following components:
• the onbar command
• Data Protector as the backup
solution
• the XBSA interface
• ON-Bar catalog tables, which are
used to back up dbobjects and track
instances of dbobjects through
multiple backups.
ONCONFIG (Informix Server specific
term)
An environment variable that specifies
the name of the active ONCONFIG
configuration file. If the ONCONFIG
environment variable is not present,
Informix Server uses the configuration
values from the onconfig file in the
directory <INFORMIXDIR>\etc (on
Windows) or <INFORMIXDIR>/etc/
(on UNIX).
online backup
A backup performed while a database
application remains available for use.
The database is placed into a special
backup mode of operation for the time
period that the backup application
requires access to the original data
objects. During this period, the database
is fully operational, but there may be a
small performance impact and log files
may grow very quickly.
• For simple backup methods (non
ZDB), backup mode is required for
the whole backup period (~minutes/
hours). For instance, for backup to
tape, until streaming of data to tape
is finished.
• For ZDB methods, backup mode is
required for the short period of the
data replication process only
(~seconds). Normal database
operation can then be resumed for
the rest of the backup process.
In some cases, transaction logs may also
have to be backed up to allow a
consistent database to be restored.
See also zero downtime backup (ZDB)
and offline backup.