SQL>create pfile from spfile
*.control_files='/u01/oracle/oradata/ORCL/control01.ctl','/u01/oracle/oradata/ORCL/control02.ctl',
'/u01/oracle/oradata/ORCL/control03.ctl','/u01/oracle/oradata/ORCL/control04.ctl'
SQL>create spfile from pfile
B 拷贝控制文件
[oracle@oracle dbs]$ cd /u01/oracle/oradata/ORCL/
[oracle@oracle ORCL]$ cp control01.ctl control04.ctl
C 启动数据库
SQL>startup
在下面的一些情况下,可能需要重建控制文件:o 所有控制文件都已损坏或丢失
o 没有针对控制文件的备份或者备份已损坏
o 或者在一些情况下,Oracle Support建议这么做
下面是针对RAC环境下重建控制文件的具体过程, 包括两个例子。一个是以noresetlogs模式来重建控制文件,一个是以resetlogs模式来重建控制文件。如果redo logs都存在而且没有被损坏,那么可以采用noresetlogs。 使用resetlogs会将所有redo log清空而且重置log sequence为1.
在RAC上重建控制文件与单实例有一些小区别: 在重建控制文件前必须设置cluster_database=false,而且只启动一个实例来执行 *** 作,否则会报错
ORA-01503: CREATE CONTROLFILE failed
ORA-12720: operation requires database is in EXCLUSIVE mode
重建完控制文件后,需要再将cluster_database设为true.
TESTCASE1
---------------------------
用noresetlog模式重建控制文件
过程:
1.首先生成 重建 控制文件的脚本:
SQL>alter database backup controlfile to trace
Database altered.
2. 所生成的控制文件的脚本会在udump下:
SQL>show parameter user_dump_dest
NAME TYPEVALUE
------------------------------------ ----------- ------------------------------
user_dump_dest string /u01/app/oracle/diag/rdbms/racdb/RACDB1/trace
数据库的Alert log中也会详细输出这个文件的路径和名字:
alter database backup controlfile to trace
Backup controlfile written to trace file /u01/app/oracle/diag/rdbms/racdb/RACDB1/trace/RACDB1_ora_10076.trc
3. 停止所有数据库实例:
[oracle@rac1 trace]$ srvctl stop database -d RACDB
4. 用noresetlog重建控制文件:
[oracle@rac1 trace]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.3.0 Production on Tue Jan 8 11:23:44 2013
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to an idle instance.
SQL>startup nomount<==启动一个实例
ORACLE instance started.
Total System Global Area 739065856 bytes
Fixed Size 2232032 bytes
Variable Size 549454112 bytes
Database Buffers 184549376 bytes
Redo Buffers2830336 bytes
SQL>CREATE CONTROLFILE REUSE DATABASE "RACDB" NORESETLOGS ARCHIVELOG
2 MAXLOGFILES 192
3 MAXLOGMEMBERS 3
4 MAXDATAFILES 1024
5 MAXINSTANCES 32
6 MAXLOGHISTORY 292
7 LOGFILE
8GROUP 1 (
9 '+DATA/racdb/onlinelog/group_1.261.783272805',
10 '+RECO/racdb/onlinelog/group_1.257.783272807'
11) SIZE 50M BLOCKSIZE 512,
12GROUP 2 (
13 '+DATA/racdb/onlinelog/group_2.262.783272807',
14 '+RECO/racdb/onlinelog/group_2.258.783272809'
15) SIZE 50M BLOCKSIZE 512,
16GROUP 3 (
17 '+DATA/racdb/onlinelog/group_3.269.804115405',
18 '+RECO/racdb/onlinelog/group_3.261.804115405'
19) SIZE 50M BLOCKSIZE 512,
20GROUP 4 (
21 '+DATA/racdb/onlinelog/group_4.270.804115405',
22 '+RECO/racdb/onlinelog/group_4.263.804115407'
23) SIZE 50M BLOCKSIZE 512
24 -- STANDBY LOGFILE
25 DATAFILE
26'+DATA/racdb/datafile/system.256.783272707',
27'+DATA/racdb/datafile/sysaux.257.783272707',
28'+DATA/racdb/datafile/undotbs1.258.783272707',
29'+DATA/racdb/datafile/users.259.783272707',
30'+DATA/racdb/datafile/example.264.783272831',
31'+DATA/racdb/datafile/undotbs2.265.783273081'
32 CHARACTER SET AL32UTF8
33
CREATE CONTROLFILE REUSE DATABASE "RACDB" NORESETLOGS ARCHIVELOG
*
ERROR at line 1:
ORA-01503: CREATE CONTROLFILE failed
ORA-12720: operation requires database is in EXCLUSIVE mode <============由于没有设置cluster_database=false,所以报错
需要将设置cluster_database=false:
SQL>alter system set cluster_database=false scope=spfile
System altered.
SQL>shutdown immediate
ORA-01507: database not mounted
ORACLE instance shut down.
SQL>startup nomount
ORACLE instance started.
Total System Global Area 739065856 bytes
Fixed Size 2232032 bytes
Variable Size 549454112 bytes
Database Buffers 184549376 bytes
Redo Buffers2830336 bytes
SQL>CREATE CONTROLFILE REUSE DATABASE "RACDB" NORESETLOGS ARCHIVELOG
2 MAXLOGFILES 192
3 MAXLOGMEMBERS 3
4 MAXDATAFILES 1024
5 MAXINSTANCES 32
6 MAXLOGHISTORY 292
7 LOGFILE
8GROUP 1 (
9 '+DATA/racdb/onlinelog/group_1.261.783272805',
10 '+RECO/racdb/onlinelog/group_1.257.783272807'
11) SIZE 50M BLOCKSIZE 512,
12GROUP 2 (
13 '+DATA/racdb/onlinelog/group_2.262.783272807',
14 '+RECO/racdb/onlinelog/group_2.258.783272809'
15) SIZE 50M BLOCKSIZE 512,
16GROUP 3 (
17 '+DATA/racdb/onlinelog/group_3.269.804115405',
18 '+RECO/racdb/onlinelog/group_3.261.804115405'
19) SIZE 50M BLOCKSIZE 512,
20GROUP 4 (
21 '+DATA/racdb/onlinelog/group_4.270.804115405',
22 '+RECO/racdb/onlinelog/group_4.263.804115407'
23) SIZE 50M BLOCKSIZE 512
24 -- STANDBY LOGFILE
25 DATAFILE
26'+DATA/racdb/datafile/system.256.783272707',
27'+DATA/racdb/datafile/sysaux.257.783272707',
28'+DATA/racdb/datafile/undotbs1.258.783272707',
29'+DATA/racdb/datafile/users.259.783272707',
30'+DATA/racdb/datafile/example.264.783272831',
31'+DATA/racdb/datafile/undotbs2.265.783273081'
32 CHARACTER SET AL32UTF8
33
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