oracle 12c 支援級聯 standby dataguard

Real-Time Cascading

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.

有時間要自己測試下。