In your database, there are tablespaces that were read-only when the last backup was taken. These
tablespaces have not been made read/write since then. You want to perform an incomplete recovery on the
database by using a backup control file.
What precaution must you take for the read-only tablespaces before performing an incomplete recovery?A. All the read-only tablespaces should be taken offline.
B.
All the read-only tablespaces should be restored separately.
C.
All the read-only tablespaces should be renamed to have the MISSINGnnnn format.
D.
All the read-only tablespaces should be made online with logging disabled.
ans A or B
Ans A
Refer section – Recovering Read-Only Tablespaces with a Backup Control File
https://docs.oracle.com/database/121/BRADV/osadvsce.htm#BRADV227
Thank You