OCP 1Z0 053 100

100.Examine the following command that is used to duplicate a database on the same host: 
RMAN> RUN 
{
ALLOCATE AUXILIARY CHANNEL, aux 1 DEVICE TYPE DISK;
DUPLICATE TARGET DATABASE TO auxdb SKIP READONLY; \ } 
Which two statements describe the effect after the database is duplicated successfully? (Choose two) 
A. The data files of the read-only tablespaces in the target database are not duplicated 
B. The read-only tablespaces in the target database are still defined in new the database 
C. The read-only tablespaces in the target database are changed to online after duplication 
D. The data files of the read-only tablespaces in the target database get duplicated 
E. The read-only tablespaces in the target database are not defined in the new database 
Answer: AB

因数据字典中仍然有该tablespace的定义，所以目标库中同样也有该tablespace的定义。

http://docs.oracle.com/cd/E11882_01/backup.112/e10643/rcmsynta020.htm#RCMRF90163

SKIP READONLYExcludes data files in current read-only tablespaces from the duplicate database. By default RMAN duplicates current read-only tablespaces.

If a tablespace is currently read/write, but you use untilClause to duplicate the database to an SCN at which the tablespace was read-only, then RMAN does not include the tablespace in the duplicate database. Tablespaces that were read-only previously are considered offline tablespaces and so are not included in the duplication.

Note: The read-only tablespaces must be self-contained for the DUPLICATE command to succeed with this option.