多项选择题 ImmediatelyafteraddinganewdisktoorremovinganexistingdiskfromanAutomaticStorageManagement（ASM）instance，youfindthattheperformanceofthedatabasedecreasesinitially，untiltheadditionorremovalprocessiscompleted.Performancethengraduallyreturnstonormallevels.Whichtwoactivitiescouldyouperformtomaintainaconsistentperformanceofthedatabasewhileaddingorremovingdisks？（）

单项选择题 YouworkasadatabaseadministratoratCertkiller.com.Inyourproductiondatabasethereisajob，CALC_STAT，whichhasbeenscheduledtoruneveryFridayat5.00p.m.CALC_STATupdatestheoptimizerstatisticsfortheobjectsownedbytheAPPSschema.Youwantthetasktobegeneric，therebyallowinguserstomodifytheattributesofthetaskatruntimewithoutaffectingtheoriginaltask.WhichcomponentofOracleSchedulermustyoudefinetoachievethis？（）

单项选择题 Consider the following configuration：  /devices/D1is a member of disk group dgroupA.  /devices/D2is a member of disk group dgroupA.  /devices/D3is a member of disk group dgroupA.  You plan to add a new disk， /devices/D4，to the disk group dgroupA.  You execute the following command：  SQL> ALTER DISKGROUP dgroupA ADD DISK ’/devices/D*’；  Which task would be accomplished by the command？（）