有这么一题：
112. What is recommended initial size for a tablespace containing an RMAN recovery catalog?
Answer: 20M
但在Sybex 中有这么一段：
Oracle recommends the following space requirements for RMAN in
tablespaces for one-year growth in the recovery catalog database: system
tablespace, 50MB; rollback tablespace, 5MB; temp tablespace, 5MB; and the recovery catalog tablespace, 10MB.
它建议是10M
不知Oracle原教材是多少？
