Which three factors can influence the rate of redo apply on a physical standby database?
A.
the network latency between the primary and standby databases
B.
the number of archiver processes on the standby database
C.
the number and size of standby redo logs on the primary database
D.
the rate of redo generation on the primary database
E.
the number and size of standby redo logs on the standby database
Explanation:
Consider using the following methods to optimize the time it takes to apply redo to physical standby databases.
* (B) Set Parallel Recovery to Twice the Number of CPUs on One Standby Host
* (E) During media recovery or Redo Apply, the redo log file is read, and data blocks that require redo
application are parsed out. With parallel media recovery, these data blocks are subsequently distributed evenly
to all recovery processes to be read into the buffer cache. The default is serial recovery or zero parallelism,
which implies that the same recovery process reads the redo, reads the data blocks from disk, and applies the
redo changes.
https://docs.oracle.com/cd/B19306_01/server.102/b14239/manage_ps.htm#BACHIBGG
Seems correct answer is A, D, E
http://www.oracle.com/technetwork/database/availability/redo-apply-2745943.pdf
BDE makes more sense for me.
network latency is not related with apply rate, it is related with ship rate.
If you follow your corollary, D is not right