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Oracle Tips by Burleson |
Oracle10g Grid Computing
with RAC
Chapter 13 - Oracle RAC Backup and Recovery
Parallel Recovery
Recovery with
Oracle Database 10g RAC is automatically parallel for these three
stages of recovery:
-
Restoration of data files.
-
Application of incremental backups.
-
Application of
redo logs.
The number of channels configured for a RAC
database in RMAN determines the degree of parallelism for data file
restoration. In the previous example configuration, we could have
two streams involved in restoring data files since we configured two
channels. The degree of parallelism for restoration of incremental
backups is also dependent on the number of configured channels.
Redo logs are applied by RMAN using the degree
of parallelism specified in the initialization parameter
recovery_parallelism.
Using manual recovery methods such as sqlplus
(remember, in Oracle Database 10g there is no server manager
program, so all DBA functions are done through SQLPLUS), we can
specify values for recovery_parallelism,
since it is a dynamic parameter. However, it cannot exceed
the setting for parallel_max_servers.
Using the DEGREE option for the RECOVER command, we can also control
the degree of parallelism for other recovery operations.
For more information,
see the book
Oracle 11g Grid and Real Application Clusters - 30% off if
you buy it directly from Rampant TechPress .
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