It is now possible to forward Redo in Real-Time Mode from the first to the cascaded Standby Database. So the Redo Record is forwarded to the cascaded Standby Database once written into a Standby RedoLog of the first Standby Database.
Non Real-Time Cascading means that the whole Log Sequence is
transferred to the terminal Standby Database(s) after a Log Switch on
the Primary Database.
有时间要自己测试下。
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