如何查看Oracle11g控制文件里面的内容

1.生成控制文件的转储文件

SQL> select * from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
PL/SQL Release 11.2.0.3.0 - Production
CORE 11.2.0.3.0 Production
TNS for Linux: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production

SQL> alter database backup controlfile to trace ;

Database altered.

SQL>

2.查找生成的转储文件
我们知道，用户生成的TRACE文件存储在udump目录下。在Oracle10g中，udump路径是$ORACLE_HOME/admin/SID/udump，而Oracle11g则大不一样。我们可以通过查看user_dump_dest参数来定位udump目录的具体位置。

SQL> show parameter user_dump_dest

-- LOG_ARCHIVE_DEST_1='MANDATORY NOREOPEN NODELAY'

-- LOG_ARCHIVE_DEST_1='ARCH NOAFFIRM EXPEDITE NOVERIFY SYNC'

-- LOG_ARCHIVE_DEST_1='NOREGISTER NOALTERNATE NODEPENDENCY'

-- LOG_ARCHIVE_DEST_1='NOMAX_FAILURE NOQUOTA_SIZE NOQUOTA_USED NODB_UNIQUE_NAME'

-- LOG_ARCHIVE_DEST_1='VALID_FOR=(PRIMARY_ROLE,ONLINE_LOGFILES)'

CHARACTER SET AL32UTF8
;
-- Commands to re-create incarnation table
-- Below log names MUST be changed to existing filenames on
-- disk. Any one log file from each branch can be used to
-- re-create incarnation records.
-- ALTER DATABASE REGISTER LOGFILE '/u01/app/oracle/product/11.2.0/dbhome_1/dbs/
arch1_1_762197622.dbf';

-- ALTER DATABASE REGISTER LOGFILE '/u01/app/oracle/product/11.2.0/dbhome_1/dbs/
arch1_1_860888149.dbf';

CHARACTER SET AL32UTF8
;
-- Commands to re-create incarnation table
-- Below log names MUST be changed to existing filenames on
-- disk. Any one log file from each branch can be used to
-- re-create incarnation records.
-- ALTER DATABASE REGISTER LOGFILE '/u01/app/oracle/product/11.2.0/dbhome_1/dbs/
arch1_1_762197622.dbf';

-- ALTER DATABASE REGISTER LOGFILE '/u01/app/oracle/product/11.2.0/dbhome_1/dbs/
arch1_1_860888149.dbf';

我们可以看到转储文件里包含了数据库的名字、数据文件的位置等信息，并且按照是否需要resetlogs分别给出了创建控制文件的sql语句。控制文件非常重要，我们可以把它备份下来以防万一。