Database Reference
In-Depth Information
from the database to the backup device. If you can create multiple channels to different backup
devices (say two channels to two different disk drives or tape devices), then you can speed up
the performance of your backups in many cases.
Oracle also provides the DURATION parameter associated with the BACKUP command,
which allows you to indicate to Oracle how much overall impact it should allow the backup
to have on the database as a whole. When using the DURATION parameter, you indicate the
overall duration that you want the backup to run. If it runs over that (say 5 hours), then
RMAN will terminate the backup. The data files already backed up will still be valid, but
there may be data files that are not backed up. RMAN will prioritize any missed data file
backups on the subsequent backup operation.
incomplete Backups
If a backup does not complete after the amount of time identified in the DURATION parameter,
then the whole backup will be considered to have failed. Other backup operations within a
RUN block will not be executed as a result. You can use the PARTIAL keyword to indicate to
RMAN that it should consider the backup to have been successful and not return an error.
This will allow subsequent commands (like archive-log backups) to execute. Here is an
example of the use of the PARTIAL keyword:
RMAN> Backup as compressed backupset duration 1:00
partial minimize load database ;
If you use the DURATION MINIMIZE LOAD parameter when performing a backup, then you
will be indicating to Oracle that you want it to reduce the load that the backup has on the
database as a whole. When MINIMIZE LOAD is used, Oracle will try to spread the backup
over the entire time identified in the DURATION parameter. This will result in slower backup
times but improved overall database performance. Here is an example of the use of the
DURATION parameter in the BACKUP command:
RMAN> Backup as compressed backupset duration 1:00 minimize load database;
The Oracle Database Fault
Diagnostic Framework
One of the objectives listed in the Oracle 12 c OCP exam is knowledge of the Oracle Automatic
Diagnostic Workflow. To understand this feature in Oracle, you first need to understand the
architecture that underlies this workflow. This architecture is called the Oracle Database Fault
Diagnostic Framework.
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