YouworkasadatabaseadministratorforSupportcenter.cn.Youwanttocreateyourdatabasewiththeautomaticundomanagementfeatureenable.Whichtwotasksmustyouperformtoachievethis？（）

A.SettheUNDO_RETENTIONparametertoAUTO.
B.Createaninitialundosegmentinundotablespace.
C.SettheUNDO_RETENTIONparameterto900ormore
D.SettheinitializationparameterUNDO_MANAGEMENTtoAUTO
E.SettheUNDO_MANAGEMENTparametertothenameofanundotablespace

【参考答案】

D, E