[多项选择] Immediately after adding a new disk to or removing an existing disk from an Automatic StorageManagement （ASM） instance， you find that the performance of the database decreases initially， until the addition or removal process is completed. Performance then gradually returns to normal levels. Which two activities could you perform to maintain a consistent performance of the database while adding or removing disks？（）
A. increase the number of checkpoint processes
B. define the POWER option while adding or removing the disks
C. increase the number of DBWR processes by setting up a higher value for DB_WRITER_PROCESSES
D. increase the number of slave database writer processes by setting up a higher value for DBWR_IO_SLAVES
E. increase the number of ASM Rebalance processes by setting up a higher value for ASM_POWER_LIMIT during the disk addition or removal process

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