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To increase the availability of an Advanced Replication environment， you can add a new master to a replication group without quiescing the group. This is achieved（）.
A:Only when the new master site already has existing replication groups. 
B:By issuing a single command to create, populate, and activate the new master. 
C:When the master definition site is not the same for all of the master groups. 
D:Without impacting end users who are executing data manipulation language (DML) commands on the replicated tables.

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出自：Oracle认证

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