period (several minutes or hours). For instance, for backup to tape, until streaming of data to the tape is finished.

•For ZDB methods, the database is also put into the quiescent state, but for the period of the data replication process only (several seconds). Normal database operation can then be resumed for the rest of the backup process.

See also zero downtime backup (ZDB) and online backup.

offline recovery

Offline recovery is performed if the Cell Manager is not

 

accessible, for example, due to network problems. Only

 

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 (several minutes or hours). For instance, for backup to tape, until streaming of data to tape is finished.

Concepts guide

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