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System Administrator’s Guide U42252-J-Z915-1-76
The individual Components The Backup Component
3.2.2 Online Backup of the Database
An online backup of the database is performed whenever the database is open
at the time of the backup. In contrast to offline backups, the following phases are
carried out:
1. All database files allocated to a tablespace are determined.
2. Backup is commenced with the ORACLE-specific command
alter tablespace <tablespacename> begin backup.
3. All database files of this tablespace are backed up, irrespective of whether
they are system files or raw devices.
4. Completion of the backup is indicated to the database system with the
command alter tablespace <tablespacename> end backup.
3.2.3 Configuration and management
The configuration file dbo${ORACLE_SID}.init, which must be located in the
directory ${DBO_CONFIG_DIRECTORY}/config, can be used to determine cer-
tain characteristics of the backup component. The following representation
shows the parameters which are relevant to the backup component and located
in the dbo${ORACLE_SID}.init configuration file (a model file named dbo.init is
stored in the directory $NSR_INST/oracle/config). This configuration file is cre-
ated automatically using the program configure_nsrora (see also the chapter
“Installation and Configuration”).
The backup_TS_on_different_clients configuration file allows to split a backup
among different NetWorker servers; when using ORACLE Parallel Server
(OPS) also among different NetWorker clients.
To enable this feature, the file backup_TS_on_different_clients must be created in
the /nsr/oracle/$ORACLE_SID/config direcory. If the file does not exist, NSR-ORA
behaves as usual. You can find an example of such a configuration file in the
/opt/nsr/oracle/config directory (for HP-UX: /opt/networker/oracle/config). The
entries also are described there in detail.
If you split a backup, Recover until Time is not possible any more.
!