RMAN is connected to a target database instance and an auxiliary instance. You execute the command:
RMAN> DUPLICATE TARGET DATABASE
TO dupdb
FROM ACTIVE DATABASE
SECTION SIZE 1G;
What is the outcome?
A.
RMAN uses the push method to transfer image copies.
B.
RMAN uses the push method to transfer backup sets.
C.
RMAN uses the pull method to restore files using backup sets.
D.
RMAN uses the pull method to restore files using image copies.
C
If you specify the SECTION SIZE parameter on the BACKUP command, then RMAN creates a backup set
When active database duplication is performed using image copies, after RMAN establishes a connection with the source database, the source database transfers the required database files to the auxiliary database. Using image copies may require additional resources on the source database. This method is referred to as the push-based method of active database duplication.
When RMAN performs active database duplication using backup sets, a connection is established with the source database and the auxiliary database. The auxiliary database then connects to the source database through Oracle Net Services and retrieves the required database files from the source database. This method of active database duplication is also to as the pull-based method.
C
When active db duplicate is performed using image copies = Push-based method.
When active db duplicate is performed using backup sets = Pull-based method.
RMAN only uses image copies to perform active database duplication when no auxiliary channels are allocated or when the number of auxiliary channels allocated is less than the number of target channels.
Link: https://docs.oracle.com/database/121/BRADV/rcmdupdb.htm#BRADV89928
C