Oracle 12c Real-Time cascade standby database
Cascade standby database feature is introduced from 9i , Cascade standby database works same as standby database but it receives the redo logs from the first standby database but not primary database directly. In fact cascading standby database bypasses redo logs to the cascade standby. So there is much scope to reduce load , bandwidth utilization on primary database. But prior to 12c, Cascaded standby database will not be having fresh data same as cascading standby and now from 12c Cascaded standby database popularized with Real-Time Apply and now there is no more scope of LAG between primary and cascaded standby database. We will see more insight on the configuration, validation of Real-Time apply and usage of Data Guard Broker.For complete article read URL
