有人问到这个问题,当我们创建控制文件时指定的以下这些参数，是否可以从数据库的字典表中查询得到?

MAXLOGFILES
MAXLOGMEMBERS
MAXDATAFILES
MAXINSTANCES
MAXLOGHISTORY

答案是除了MAXLOGMEMBERS以外，其他的都不可以。
MAXLOGMEMBERS可以从X$KCCDI.DIMLM得到。

X$KCCDI---[K]ernel [C]ache [C]ontrolfile management [D]atabase [I]nformation

其中DIMLM的含义为:Maximum number of log file members allowed

SQL> select dimlm from x$kccdi;

     DIMLM
----------
         3

如果想获得其他参数信息，那么只能通过转储控制文件的方式获得：

alter database backup controlfile to trace;

You executed the following command to backup control file:
ALTER DATABASE BACKUP CONTROLFILE TO TRACE;
what do you find in the trace file?

SQL> alter database backup controlfile to trace;

Database altered.

SQL> show parameter user

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
license_max_users                    integer     0
parallel_adaptive_multi_user         boolean     TRUE
user_dump_dest                       string      D:/ORACLE/PRODUCT/10.2.0/DB_2/
                                                 ADMIN/BACKUP/UDUMP

refenece : http://www.eygle.com/archives/2005/08/where_are_the_c.html

http://blog.csdn.net/amber112/article/details/6260397

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Where Are The Controlfile 'Max' Parameters Stored?

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