Fast-Start Time-Based Recovery Limit
You can specify the target mean time to recover (MTTR) for instance recovery by setting initialization parameter FAST_START_MTTR_TARGET to a value between 0 and 3,600 seconds. Set it dynamically by:
ALTER SYSTEM SET FAST_START_MTTR_TARGET = number_of_seconds ;
A lower value results in more frequent checkpointing by Oracle but a faster instance recovery. You no longer set values for initialization parameters FAST_START_IO_TARGET and LOG_CHECKPOINT_INTERVAL when using this new feature. Oracle uses FAST_START_MTTR_TARGET to calculate and set these values internally. If you do code them, they override the values Oracle would otherwise calculate based on FAST_START_MTTR_TARGET. 9i makes obsolete the initialization parameter DB_BLOCK_MAX_DIRTY_TARGET.
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