题目内容:
A.Onlywhenthenewmastersitealreadyhasexistingreplicationgroups.B.Byissuingasinglecommandtocreate,populate,andactivatethenewmaster.
C.Whenthemasterdefinitionsiteisnotthesameforallofthemastergroups.
D.Withoutimpactingenduserswhoareexecutingdatamanipulationlanguage(DML)commandsonthereplicatedtables.
参考答案: