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Additional R2 RMAN Enhancements...
Missing tempfiles automatically recreated during open
- After whole database restore / recovery
Unused block compression
- Under the right conditions, unused blocks are not written to backupset
RAC dynamic channel allocation
Notes:
Oracle10g Release 2 also provides these RMAN enhancements:
After a whole (full) database restore and recovery, and at database open, Oracle will automatically created missing tempfiles. The original size, location, AUTOEXTEND and MAXSIZE attributes are used to recreate the tempfile. The tempfile must be locally managed (as opposed to dictionary managed). Refer to Chapter 6 of the Oracle Database Backup and Recovery Basics 10g Release 2 manual for more information on this feature.
If certain conditions are met, Release 2 of 10g RMAN will backup only in-use blocks (previous releases of RMAN backed up any block that ever contained data – even if it was not currently in-use (this was called “NULL compression”)). Refer to the BACKUP command in the Oracle 10g Release 2 Recovery Manager Reference for more information. The conditions include:
Full or Level 0 backup
No guaranteed restore points in effect
Locally managed datafile
Disk-based backupset
RAC backups no longer require manual channel allocation for each node – dynamic channel allocation is now supported. For more information, refer to Chapter 1 of the Oracle 10g R2 New Features Guide and Chapter 8 of the Oracle 10g R2 Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide.