update:在Itpub论讨了该问题，有经验丰富的家伙给出了解决方法^_^

在mount状态的时候，如果你desc dba_*数据字典，会报错：
SYS@ning>select status from v$instance;

STATUS
------------
MOUNTED

SYS@ning>desc dba_data_files
ERROR:
ORA-04043: object dba_data_files does not exist

然后，即使你将数据库alter database open到open状态，还是会报同样的错误：
SYS@ning>alter database open;

Database altered.

SYS@ning>desc dba_data_files
ERROR:
ORA-04043: object dba_data_files does not exist

SYS@ning>select * from dba_data_files;
select * from dba_data_files
*
ERROR at line 1:
ORA-00942: table or view does not exist

SYS@ning>desc dba_temp_files;
Name Null? Type
----------------------------------------- -------- ----------------------------
FILE_NAME VARCHAR2(513)
FILE_ID NUMBER
TABLESPACE_NAME NOT NULL VARCHAR2(30)
BYTES NUMBER
BLOCKS NUMBER
STATUS CHAR(9)
RELATIVE_FNO NUMBER
AUTOEXTENSIBLE VARCHAR2(3)
MAXBYTES NUMBER
MAXBLOCKS NUMBER
INCREMENT_BY NUMBER
USER_BYTES NUMBER
USER_BLOCKS NUMBER

也就是说，只要你在mount状态下desct过某个dba视图，oracle就不认识它了，除非你重启数据库.

oracle说这个bug影响的版本为Oracle Server - Enterprise Edition - Version: <8.1.7.4 to 10.1.0.3

实际上，我上面的操作都是在10.2.0.3中，这么多版本了，oracle就一直没想过要修复这个问题？还是给出下面这种哭笑不得的解决方法：
1) Don't describe the dba_* views at mount stage.
2) If you issue DESC of any DBA_*views at mount stage, then shutdown and restart the
instance.

参考:
Note:296235.1
Bug 2365821

ITPub博客

碰到一个小bug 2365821

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