在ASM和本地磁盘的2种情况下控制文件配置多个副本。
归档模式下的情况：
SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /u01/oracle/10g/arch
Oldest online log sequence 22
Next log sequence to archive 24
Current log sequence 24
本地磁盘方式：
SQL> show parameter control_files;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
control_files string /u01/oracle/10g/oradata/gt10g/
control1.ctl
SQL> alter system set control_files='/u01/oracle/10g/oradata/gt10g/control1.ctl','/u01/oracle/10g/oradata/gt10g/control2.ctl' scope=spfile;
System altered.
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
接下来我们可以使用RMAN方式来恢复控制文件
RMAN> startup nomount;
Oracle instance started
Total System Global Area 520093696 bytes
Fixed Size 2097496 bytes
Variable Size 138415784 bytes
Database Buffers 373293056 bytes
Redo Buffers 6287360 bytes
RMAN> restore controlfile from '/u01/oracle/10g/oradata/gt10g/control1.ctl';
Starting restore at 25-FEB-13
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=156 devtype=DISK
channel ORA_DISK_1: copied control file copy
output filename=/u01/oracle/10g/oradata/gt10g/control1.ctl
output filename=/u01/oracle/10g/oradata/gt10g/control2.ctl
Finished restore at 25-FEB-13
RMAN> sql 'alter database mount';
sql statement: alter database mount
released channel: ORA_DISK_1
RMAN> sql 'alter database open';
sql statement: alter database open
SQL> show parameter control_files;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
control_files string /u01/oracle/10g/oradata/gt10g/
control1.ctl, /u01/oracle/10g/
oradata/gt10g/control2.ctl
也可以使用pfile的方式修改参数文件指向新的控制文件的OS cp副本，这里就不做演示。
ASM方式：
SQL> show parameter control_files;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
control_files string +DATA01/gt10g/controlfile/curr
ent.257.808238085
SQL> alter system set control_files='+DATA01/gt10g/controlfile/current.257.808238085','+DATA01','+DATA01' scope=spfile;
System altered.
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
RMAN> startup nomount;
Oracle instance started
Total System Global Area 520093696 bytes
Fixed Size 2097496 bytes
Variable Size 138415784 bytes
Database Buffers 373293056 bytes
Redo Buffers 6287360 bytes
RMAN> restore controlfile from '+DATA01/gt10g/controlfile/current.257.808238085';
Starting restore at 25-FEB-13
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=156 devtype=DISK
channel ORA_DISK_1: copied control file copy
output filename=+DATA01/gt10g/controlfile/current.257.808238085
output filename=+DATA01/gt10g/controlfile/current.268.808304299
output filename=+DATA01/gt10g/controlfile/current.267.808304301
Finished restore at 25-FEB-13
RMAN> sql 'alter database mount';
sql statement: alter database mount
released channel: ORA_DISK_1
RMAN> sql 'alter database open';
sql statement: alter database open
www.zzzyk.com
SQL> show parameter control_files;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
control_files string +DATA01/gt10g/controlfile/curr
ent.257.808238085, +DATA01/gt1
0g/controlfile/current.268.808
304299, +DATA01/gt10g/controlf
ile/current.267.808304301
非归档模式下的配置方式也是一样，就不在演示。
-The End-
