Real-Time Query has no limitations regarding the protection level of the Data Guard environment.
C.
Disabling Real-Time Query prevents the automatic start of redo apply when a physical standby databases opened read only.
D.
Real-Time Query sessions can be connected to a Far Sync instance.
E.
A standby database enabled for Real-Time Query cannot be the Fast-Start Failover target of the Data Guard configuration.
The Answer Is:
A, C
This question includes an explanation.
Explanation:
Real-Time Query is a feature that allows queries to be run on a physical standby database while it is applying redo data. The relevant truths about it are:
Setting standby_max_data_delay=0 requires synchronous redo transport (A):For the real-time apply feature to function with no data delay (zero delay), synchronous redo transport must be used. This setting ensures that the data on the standby database is as current as possible before queries are executed against it.
[References:, Oracle Data Guard Concepts and Administration Guide, ]
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