Default value: 1 (even if the parameter is not set)

Possible values: n (n>=1). The value 1 specifies that parallel processing is not required. n should have a value between m and 2*m , depending on the number m of disks affected.

When doing a parallel recovery, the change entries are read from the redo log sequentially but are written to the data files in parallel. You should use this parameter only if more than one hard disk is involved in the recovery procedure.