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Steps of Parallel Recovery

1) When you start parallel recovery, the Oracle server starts one recovery session and several recovery processes as specified in this image, it is specified as 2 in command line.

2) The recovery session reads the redo log file sequentially and dispatches the redo information to the recovery processes

3) The recovery processes apply the changes from the redo log file to the appropriate data files. Since Oracle creates the recovery processes automatically, the need to use more than one session to perform recovery is eliminated.