You can control instance recover performance by setting parameters to define targets for（）

• A、The size of the redo buffer in SGA. 
• B、The instance that will perform recovery in Real Application Cluster database. 
• C、The number of blocks to be read during instance recovery, or the time needed to complete instance recovery. 
• D、The number of passes through the redo logs made by the recovery process to identify blocks needing recovery.