Parallel Recovery in Oracle RAC
Oracle AI Database automatically selects the optimum degree of parallelism for instance, crash, and media recovery.
Oracle AI Database applies archived redo logs using an optimal number of parallel processes based on the availability of CPUs. You can use parallel instance recovery and parallel media recovery in Oracle RAC databases as described under the following topics:
Related Topics
Parallel Recovery with RMAN
Learn how to use parallel recovery with RMAN.
With RMAN's RESTORE and RECOVER commands, Oracle AI Database automatically makes parallel the following three stages of recovery:
Restoring Data Files
When restoring data files, the number of channels you allocate in the RMAN recover script effectively sets the parallelism that RMAN uses. For example, if you allocate five channels, you can have up to five parallel streams restoring data files.
Applying Incremental Backups
Similarly, when you are applying incremental backups, the number of channels you allocate determines the potential parallelism.
Applying Archived Redo Logs
With RMAN, the application of archived redo logs is performed in parallel. Oracle AI Database automatically selects the optimum degree of parallelism based on available CPU resources.
Disabling Parallel Recovery
Learn how to disable parallel recovery.
You can override parallel recovery using the procedures under the following topics:
Disabling Instance and Crash Recovery Parallelism
Learn how to disable instance and crash recovery parallelism.
To disable parallel instance and crash recovery on a system with multiple CPUs, set the RECOVERY_PARALLELISM parameter in the database initialization parameter file, SPFILE, to 0 or 1.
Disabling Media Recovery Parallelism
Learn how to disable media recovery parallelism.
Use the NOPARALLEL clause of the RMAN RECOVER command or the ALTER DATABASE RECOVER statement to force Oracle AI Database to use non-parallel media recovery.