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System Administrator’s Guide U42252-J-Z915-1-76
Introduction Archive Mode of the Database
NSR-ORA checks that the database is in ARCHIVELOG mode, and will abort
the backup of the database if this is not the case if an online backup is to be car-
ried out. An offline backup can be performed even if the database is not in
ARCHIVELOG mode.
Figure 3: Database running in ARCHIVELOG mode
The database system deals only with archiving, it does not provide for the
subsequent management of the redolog files. The database will come to a halt
as soon as the archive directory is full. NSR-ORA therefore contains a module
which monitors the archiving process, the archiving monitor amon. At regular
time intervals, the daemon of the archiving monitor transfers the redolog files
archived by ORACLE to external backup media.
To make a full database backup, all file types must be included in the saving
procedure.
Both the control file and the database programs (executables) can be backed
up using standard NetWorker functions (i.e. without NSR-ORA).
For securing the database files, NSR-ORA supports full backup as well as
restoration and recovery of the database by reapplying the redolog files.
For a backup, a correlation is first made between tablespaces and database
files. In this manner, the logical tablespace concept of the database is mapped
onto a physical structure, and the database files are then backed up. In the case
of an online backup, the ORACLE-specific commands begin backup and end
backup are included.
When a recovery is required, shutdown of the database is followed by a crash
analysis. If a database file has been lost, the required backup files are first
restored from the backup medium. The recovery of the database is subse-
quently commenced; this involves reapplying the appropriate redolog files. If
control file
USER
database files
redolog files
SYSTEM TEMP
Tablespaces
Oracles
archiving
process
archive
directory