控制文件實驗

 

SQL> conn / as sysdba
Connected.
SQL> show parameter control_file

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
control_file_record_keep_time        integer     7
control_files                        string      /u01/app/oracle/oradata/orcl/c
                                                 ontrol01.ctl, /u01/app/oracle/
                                                 oradata/orcl/control02.ctl, /u
                                                 01/app/oracle/oradata/orcl/con
                                                 trol03.ctl




[root@station4 ~]# ls -l /u01/app/oracle/oradata/orcl/control01.ctl
-rw-r----- 1 oracle oinstall 7159808 Mar  9 14:08 /u01/app/oracle/oradata/orcl/control01.ctl
[root@station4 ~]# rm -i /u01/app/oracle/oradata/orcl/control01.ctl
rm: remove regular file `/u01/app/oracle/oradata/orcl/control01.ctl'? y


SQL> shutdown immediate;
ORA-00210: cannot open the specified control file
ORA-00202: control file: '/u01/app/oracle/oradata/orcl/control01.ctl'
ORA-27041: unable to open file
Linux Error: 2: No such file or directory
Additional information: 3
SQL> shutdown abort
ORACLE instance shut down.
@@@if you want to open the database will occur errors
SQL> startup
ORACLE instance started.

Total System Global Area  276824064 bytes
Fixed Size                  1218944 bytes
Variable Size              92276352 bytes
Database Buffers          180355072 bytes
Redo Buffers                2973696 bytes
ORA-00205: error in identifying control file, check alert log for more info

@@@use  oracle identify to copy the image copy from other contolfiles
[oracle@station4 ~]$ cp /u01/app/oracle/oradata/orcl/control02.ctl /u01/app/oracle/oradata/orcl/control01.ctl
@@@@alter database status
SQL> alter database mount;

Database altered.

SQL> alter database open;

Database altered.




@@@@lab 2 add new control file

SQL> shutdown immediate
Database closed.
Database dismounted./u01/app/oracle/oradata/orcl/control01.ctl
ORACLE instance shut down.



@@@@open database to nomount
@@@@add new control file
SQL> startup nomount;
ORACLE instance started.

Total System Global Area  276824064 bytes
Fixed Size                  1218944 bytes
Variable Size              96470656 bytes
Database Buffers          176160768 bytes
Redo Buffers                2973696 bytes


[oracle@station4 controlfile]$ cp /u01/app/oracle/oradata/ORCL/controlfile/control04.ctl /u01/app/oracle/oradata/orcl/control04.ctl

SQL> alter system set control_files='/u01/app/oracle/oradata/orcl/control01.ctl','/u01/app/oracle/oradata/orcl/control02.ctl','/u01/app/oracle/oradata/orcl/control03.ctl','/u01/app/oracle/oradata/orcl/control04.ctl'  scope=spfile;

System altered.

@@@shutdown database then open it
SQL> shutdown immediate
ORA-01507: database not mounted
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area  276824064 bytes
Fixed Size                  1218944 bytes
Variable Size              96470656 bytes
Database Buffers          176160768 bytes
Redo Buffers                2973696 bytes
Database mounted.
Database opened.