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MAXOPENFILES default
Number of channels <= 30
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE
'SBT_TAPE' TO '%F';
Compression off
Encryption off
NOTE:
Consistent Backup Streams: When backing up multiple data files into each backup set,
deduplication depends on consistent data file-to-backup set assignments. If the database is being
reconfigured (for example, data files are added or removed), the backup set matching will return
to normal when the data file grouping becomes consistent between backups again. For this reason,
minimize the number of times you make changes to your RMAN scripts as they can affect this
consistency.
NOTE:
If you change your RMAN scripts to generic settings from the fully-optimized FORMAT
tagging (or vice-versa), you must also rename your database backup policy/job name so that the
deduplication of that database is reset to use the new RMAN mode.
Fully-optimized RMAN Configuration for Data Protector
For larger or more complex Oracle (version 10 or higher) databases, the following RMAN changes
can be used to provide fully optimized deduplication for Data Protector environments. For optimum
Oracle deduplication you can customize your RMAN scripts to add the additional FORMAT
information with specific syntax. You must also configure the RMAN script to back up one file per
backup set to disable multiplexing.
The deduplication-optimized RMAN settings:
FORMAT 'BACKUPSPECNAME<DBNAME_%s:%t:%p:%f>.df' (for data files)
FORMAT 'BACKUPSPECNAME<DBNAME_%s:%t:%p>.al' (for log files which will be excluded
from deduplication)
FORMAT 'BACKUPSPECNAME<DBNAME_%s:%t:%p:%f>.cntrl' (for control files which will
be excluded from deduplication)
FILESPERSET 1 (only needed for the data files)
MAXOPENFILES default
Number of channels does not impact deduplication performance, but does impact backup
performance so consider increasing the number of channels while maintaining concurrency at 1)
Compression off
Encryption off
NOTE:
The FORMAT syntax must be exactly as above with _ between the DBNAME and the other
identifiers, it must have the four identifiers for data files and control files and three for the log files,
and it must use .df suffix for data files, .al suffix for log files, and .cntrl for control files.
Fully-optimized RMAN Configuration for NetBackup and Networker
For larger or more complex Oracle (version 10 or higher) databases, the following RMAN changes
can be used to provide fully optimized deduplication for Netbackup and Networker with firmware
version 3.4 and higher. For optimum Oracle deduplication you can customize your RMAN scripts
to add the additional FORMAT information (for data files use FORMAT
'df.%d.%f.<other_identifiers>'), but you must also configure the RMAN script to back
up one file per backup set.
152 VLS Configuration and Backup Application Guidelines
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