单项选择题
A. The RMAN backup fails because the TOOLS tablespace is read-only
B. The RMAN skips the backup of the tablespace because backup optimization is enabled
C. The RMAN makes backup because optimization can be enabled only for backups to disk
D. The RMAN makes the backup because no backup of the tablespace exists within the seven day window
单项选择题 Which statement describes the information returned by the DBMS_SPACE.SPACE_USAGE procedure for LOB space usage?（）
单项选择题 Which statement is true regarding online redefinition for the migration of BasicFile LOBs to SecureFile LOBs?（）
单项选择题 You need to configure fine-grained access control to external network resources from within your database. You create an access control list (ACL) using the DBMS_NETWORK_ACL_ADMIN package. Which statement is true regarding the ACL created?（）
