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在$ORACLE_HOME/dbs/下有个snapcf_sid.f文件,也就是在rman 中CONFIGURE SNAPSHOT CONTROLFILE NAME TO ‘xxxx’ 的文件,据我个人理解,它就是一个控制文件的快照,rman同步catalog或备份控制文件时会自动更新这个文件,在rman 的restore controlfile from autobackup时需要,可以用来恢复控制文件。
在metalink 也有介绍,
2.1 Snapshot Controlfile
When RMAN needs to resynchronize from a read-consistent version of the control file, it creates a temporary snapshot control file. The defaultname for the snapshot control file is port-specific. Use the set snapshot controlfile name command to change the name of the snapshot control file; subsequent snapshot control files that RMAN creates use the name specified in the command.
下面来看一位前辈的测试
结论是:
1.SNAPSHOT CONTROLFILE 不能直接copy成control file,如果数据库已经shutdown
2.可以通过rman,将SNAPSHOT CONTROLFILE 恢复成控制文件
3.如果数据库没有shutdown,可以直接copy SNAPSHOT CONTROLFILE 成控制文件,但仍需要恢复(因为他是旧的)
下面是我的测试步骤:
—————————————
查看snapshot controlfile的备份设置:
RMAN> SHOW SNAPSHOT CONTROLFILE NAME;
RMAN configuration parameters are:
CONFIGURE SNAPSHOT CONTROLFILE NAME TO ‘/u01/ora9a/product/9.2/dbs/snapcf_tt9a.f’; # default
RMAN>
下面模拟控制文件丢失的恢复
$ ls
control01.ctl cwmlite01.dbf indx01.dbf redo02.log temp01.dbf users01.dbf
control02.ctl drsys01.dbf odm01.dbf redo03.log tools01.dbf xdb01.dbf
control03.ctl example01.dbf redo01.log system01.dbf undotbs01.dbf
$ rm cont* –删除控制文件
$ ls
cwmlite01.dbf example01.dbf odm01.dbf redo02.log system01.dbf tools01.dbf users01.dbf
drsys01.dbf indx01.dbf redo01.log redo03.log temp01.dbf undotbs01.dbf xdb01.dbf
$
在控制文件被删除后,数据库还能正常操作:
SQL> insert into test(no) values(4);
1 row created.
SQL> commit;
Commit complete.
SQL> alter system switch logfile;
System altered.
SQL> alter system checkpoint;
System altered.
SQL> /
System altered.
SQL>
SQL> select no,to_char(vdate,’yyyy-mm-dd hh24:mi:ss’) from test;
NO TO_CHAR(VDATE,’YYYY-MM-DDHH24:MI:SS’)
———- ———————————————————
1 2009-02-24 10:16:09
2 2009-02-24 10:25:30
3 2009-02-24 10:26:56
4 2009-02-24 10:30:59
SQL>
重新启动数据库:
SQL> connect /as sysdba
Connected.
SQL> shutdown immediate
ORA-00210: cannot open the specified controlfile
ORA-00202: controlfile: ‘/u01/ora9a/oradata/tt9a/control01.ctl’
ORA-27041: unable to open file
IBM AIX RISC System/6000 Error: 2: No such file or directory
Additional information: 3
没有了控制文件了,shutdown immediate出错
SQL>
SQL> shutdown abort;
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 320569400 bytes
Fixed Size 741432 bytes
Variable Size 285212672 bytes
Database Buffers 33554432 bytes
Redo Buffers 1060864 bytes
ORA-00205: error in identifying controlfile, check alert log for more info
SQL>
没有控制文件,数据库不能mount,现在把SNAPSHOT CONTROLFILE copy到对应目录
$ cp /u01/ora9a/product/9.2/dbs/snapcf_tt9a.f /u01/ora9a/oradata/tt9a/control01.ctl
$ cp /u01/ora9a/oradata/tt9a/control01.ctl /u01/ora9a/oradata/tt9a/control0t.ctl
$ cp /u01/ora9a/oradata/tt9a/control01.ctl /u01/ora9a/oradata/tt9a/control03.ctl
$ ls -lrt /u01/ora9a/oradata/tt9a/contr*
-rw-r—– 1 ora9a dba 1531904 Feb 24 10:36 /u01/ora9a/oradata/tt9a/control01.ctl
-rw-r—– 1 ora9a dba 1531904 Feb 24 10:36 /u01/ora9a/oradata/tt9a/control0t.ctl
-rw-r—– 1 ora9a dba 1531904 Feb 24 10:36 /u01/ora9a/oradata/tt9a/control03.ctl
$
SQL> startup
ORACLE instance started.
Total System Global Area 320569400 bytes
Fixed Size 741432 bytes
Variable Size 285212672 bytes
Database Buffers 33554432 bytes
Redo Buffers 1060864 bytes
ORA-00205: error in identifying controlfile, check alert log for more info
照样不能mount数据库
—————————————-
尝试用rman恢复控制文件:
$ rman target /
Recovery Manager: Release 9.2.0.1.0 – 64bit Production
Copyright (c) 1995, 2002, Oracle Corporation. All rights reserved.
connected to target database (not started)
RMAN> startup nomount;
Oracle instance started
Total System Global Area 320569400 bytes
Fixed Size 741432 bytes
Variable Size 285212672 bytes
Database Buffers 33554432 bytes
Redo Buffers 1060864 bytes
RMAN> restore controlfile from ‘/u01/ora9a/product/9.2/dbs/snapcf_tt9a.f’;
Starting restore at 24-FEB-09
using target database controlfile instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=13 devtype=DISK
channel ORA_DISK_1: copied controlfile copy
replicating controlfile
input filename=/u01/ora9a/oradata/tt9a/control01.ctl
output filename=/u01/ora9a/oradata/tt9a/control02.ctl
output filename=/u01/ora9a/oradata/tt9a/control03.ctl
Finished restore at 24-FEB-09
RMAN> alter database mount;
database mounted
RMAN>
ok,用rman可以进行恢复,让数据mount起来
恢复数据库
RMAN> recover database;
Starting recover at 24-FEB-09
using channel ORA_DISK_1
starting media recovery
archive log thread 1 sequence 1 is already on disk as file /u01/ora9a/oradata/tt9a/redo01.log
archive log thread 1 sequence 2 is already on disk as file /u01/ora9a/oradata/tt9a/redo02.log
archive log thread 1 sequence 3 is already on disk as file /u01/ora9a/oradata/tt9a/redo03.log
archive log filename=/u01/ora9a/oradata/tt9a/redo01.log thread=1 sequence=0
archive log filename=/u01/ora9a/oradata/tt9a/redo02.log thread=1 sequence=2
archive log filename=/u01/ora9a/oradata/tt9a/redo03.log thread=1 sequence=3
media recovery complete
Finished recover at 24-FEB-09
RMAN> alter database open;
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of alter db command at 02/24/2009 10:47:36
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open
RMAN> alter database open resetlogs;
database opened
RMAN>
查看先前insert的数据:
SQL> select no,to_char(vdate,’yyyy-mm-dd hh24:mi:ss’) from test;
NO TO_CHAR(VDATE,’YYYY-MM-DDHH24:MI:SS’)
———- ———————————————————
1 2009-02-24 10:16:09
2 2009-02-24 10:25:30
3 2009-02-24 10:26:56
4 2009-02-24 10:30:59
SQL>
数据仍在,恢复成功!
=============================
下面仍是在数据库正常运行情况下,将控制文件删除,仍测试直接copy SNAPSHOT CONTROLFILE 的恢复方式:
SQL> insert into test(no) values(5);
1 row created.
SQL> commit;
Commit complete.
SQL>
SQL> !
$ pwd
/u01/ora9a/oradata/tt9a
$ ls
control01.ctl control0t.ctl example01.dbf redo01.log system01.dbf undotbs01.dbf
control02.ctl cwmlite01.dbf indx01.dbf redo02.log temp01.dbf users01.dbf
control03.ctl drsys01.dbf odm01.dbf redo03.log tools01.dbf xdb01.dbf
$ rm contr*
$ ls
cwmlite01.dbf example01.dbf odm01.dbf redo02.log system01.dbf tools01.dbf users01.dbf
drsys01.dbf indx01.dbf redo01.log redo03.log temp01.dbf undotbs01.dbf xdb01.dbf
$
$ exit
SQL> select * from v$controlfile;
STATUS
———————
NAME
——————————————————————————–
/u01/ora9a/oradata/tt9a/control01.ctl
/u01/ora9a/oradata/tt9a/control02.ctl
/u01/ora9a/oradata/tt9a/control03.ctl
SQL> select dbid from v$database;
select dbid from v$database
*
ERROR at line 1:
ORA-00210: cannot open the specified controlfile
ORA-00202: controlfile: ‘/u01/ora9a/oradata/tt9a/control01.ctl’
ORA-27041: unable to open file
IBM AIX RISC System/6000 Error: 2: No such file or directory
Additional information: 3
SQL>
没有控制文件,查询失败
现在将SNAPSHOT CONTROLFILE copy到对应目录,尝试直接恢复成控制文件:
SQL> !
$ pwd
/u01/ora9a/oradata/tt9a
$ cp /u01/ora9a/product/9.2/dbs/snapcf_tt9a.f control01.ctl
$ cp control01.ctl control02.ctl
$ cp control01.ctl control03.ctl
$ ls -lrt cont*
-rw-r—– 1 ora9a dba 1531904 Feb 24 10:55 control01.ctl
-rw-r—– 1 ora9a dba 1531904 Feb 24 10:55 control02.ctl
-rw-r—– 1 ora9a dba 1531904 Feb 24 10:55 control03.ctl
$
注意,此时不要起停数据库,否则这样恢复的控制文件仍不可用
尝试查询control file信息
SQL> select dbid from v$database;
DBID uWww Hotgirlsfilm %25252525D2%25252525C6%25252525B6%25252525AF%25252525C2%25252525ED%25252525CD%25252525B0%25252525A3%25252525AC%25252525D2%25252525C6%25252525B6%25252525AF%25252525C2%25252525ED%25252525CD%25252525B0%25252525A3%25252525AC%25252525B1%25252525B %B3%C9%C8%CB%BF%A8%CD%A8%CA%D3%C6%B5%C7%F8SexInSex%21%20Board %D2%C6%B6%AF%C2%ED%CD%B0%A3%AC%D2%C6%B6%AF%C2%ED%CD%B0%A3%AC%B1%B1%BE%A9%D2%C6%B6%AF%C2%ED%CD%B0%A3%AC%D2%C6%B6%AF%D7%F8%B1%E3%C6%F7 Ca Search Iezi Hot Girls Film oracle snapcf_.f/ SNAPSHOT CONTROLFILE 什么作用? | ANBOBp r 5 wWww Hotgirlsfilm %25252525D2%25252525C6%25252525B6%25252525AF%25252525C2%25252525ED%25252525CD%25252525B0%25252525A3%25252525AC%25252525D2%25252525C6%25252525B6%25252525AF%25252525C2%25252525ED%25252525CD%25252525B0%25252525A3%25252525AC%25252525B1%25252525B %B3%C9%C8%CB%BF%A8%CD%A8%CA%D3%C6%B5%C7%F8SexInSex%21%20Board %D2%C6%B6%AF%C2%ED%CD%B0%A3%AC%D2%C6%B6%AF%C2%ED%CD%B0%A3%AC%B1%B1%BE%A9%D2%C6%B6%AF%C2%ED%CD%B0%A3%AC%D2%C6%B6%AF%D7%F8%B1%E3%C6%F7 Ca Search Iezi Hot Girls Film oracle snapcf_.f/ SNAPSHOT CONTROLFILE 什么作用? | ANBOBa Kamikaze%20Girls%20Vol.74%20%CA%B7%C9%CF%D7%EE%C7%BF%B3%AC%B1%AC%C8%E9%C3%C0%C9%D9%C5%AE%21%21%C6%DF%9E%81%A4%E6%A4%A6%A4%EA Red%20Hot%20Fetish%20Collection%20Vol.87%20%20 x x Hot Girls Film 1