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Oracle9i新特点-从自动备份中恢复spfile和控制文件
下面我们来看一下这个过程:a. 设置控制文件自动备份:
[oracle@jumper oracle]$ rman target /
Recovery Manager: Release 9.2.0.3.0 - Production
Copyright (c) 1995, 2002, Oracle Corporation. All rights reserved.
connected to target database: HSJF (DBID=1052178311)
RMAN> CONFIGURE CONTROLFILE AUTOBACKUP ON;
using target database controlfile instead of recovery catalog old RMAN configuration parameters: CONFIGURE CONTROLFILE AUTOBACKUP OFF; new RMAN configuration parameters: CONFIGURE CONTROLFILE AUTOBACKUP ON; new RMAN configuration parameters are successfully stored
RMAN> exit |
这个设置可以在数据库中通过如下方式查询得到:
[oracle@jumper bdump]$ sqlplus "/ as sysdba"
SQL*Plus: Release 9.2.0.3.0 - Production on Sat Jan 17 01:08:05 2004
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to: Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production With the Partitioning, OLAP and Oracle Data Mining options JServer Release 9.2.0.3.0 - Production
SQL> select * from v$rman_configuration; CONF# NAME VALUE ---------- ------------------------- ---------- 1 CONTROLFILE AUTOBACKUP ON |
b. 记录数据库变化
SQL> create tablespace eygle 2 datafile '/data1/oracle/oradata/eygle01.dbf' 3 size 5M;
Tablespace created. |
如果新创建一个表空间,这时候检查alert.log文件,你可以在其中发现这样的备份信息:
Sat Jan 17 00:55:57 2004 Starting control autobackup Control autobackup written to DISK device handle '/opt/oracle/product/9.2.0/dbs/c-1052178311-20040117-00' Completed: create tablespace eygle datafile '/data1/oracle/oradata/eygle01.dbf’
|
如果使用rman进行备份,在提示中你可以看到如下信息:
RMAN> configure controlfile autobackup on;
old RMAN configuration parameters: CONFIGURE CONTROLFILE AUTOBACKUP OFF; new RMAN configuration parameters: CONFIGURE CONTROLFILE AUTOBACKUP ON; new RMAN configuration parameters are successfully stored
RMAN> run 2> { 3> allocate channel ch1 type disk format='e:\\oracle\\orabak\\penny%t.arc'; 4> backup archivelog all delete all input; 5> release channel ch1; 6> }
allocated channel: ch1 channel ch1: sid=13 devtype=DISK
Starting backup at 02-DEC-03 current log archived channel ch1: starting archive log backupset channel ch1: specifying archive log(s) in backup set input archive log thread=1 sequence=63 recid=168 stamp=511712617 input archive log thread=1 sequence=64 recid=169 stamp=511712620 input archive log thread=1 sequence=65 recid=170 stamp=511712626 input archive log thread=1 sequence=66 recid=171 stamp=511712690 channel ch1: starting piece 1 at 02-DEC-03 channel ch1: finished piece 1 at 02-DEC-03 piece handle=E:\\ORACLE\\ORABAK\\PENNY511712693.ARC comment=NONE channel ch1: backup set complete, elapsed time: 00:00:03 channel ch1: deleting archive log(s) archive log filename=E:\\ORACLE\\ORADATA\\PENNY\\ARCHIVE\\1_63.DBF recid=168 stamp=511712617 archive log filename=E:\\ORACLE\\ORADATA\\PENNY\\ARCHIVE\\1_64.DBF recid=169 stamp=511712620 archive log filename=E:\\ORACLE\\ORADATA\\PENNY\\ARCHIVE\\1_65.DBF recid=170 stamp=511712626 archive log filename=E:\\ORACLE\\ORADATA\\PENNY\\ARCHIVE\\1_66.DBF recid=171 stamp=511712690 Finished backup at 02-DEC-03
Starting Control File and SPFILE Autobackup at 02-DEC-03 piece handle=E:\\ORACLE\\ORA92\\DATABASE\\C-3627775766-20031202-01 comment=NONE Finished Control File and SPFILE Autobackup at 02-DEC-03
released channel: ch1 |
我们简单看一下自动备份的控制文件及spfile文件的格式及命名规则:c-IIIIIIIIII-YYYYMMDD-QQc ------------------------控制文件IIIIIIIIII---------DBIDYYYYMMDD------------时间戳QQ----------------------序号00-FF,16进制表示
c. 使用自动备份恢复spfile文件
[oracle@jumper bdump]$ rman target /
Recovery Manager: Release 9.2.0.3.0 - Production
Copyright (c) 1995, 2002, Oracle Corporation. All rights reserved.
connected to target database: HSJF (DBID=1052178311)
RMAN> restore spfile to '/tmp/spfileeygle.ora' from autobackup;
Starting restore at 17-JAN-04
using target database controlfile instead of recovery catalog allocated channel: ORA_DISK_1 channel ORA_DISK_1: sid=18 devtype=DISK channel ORA_DISK_1: looking for autobackup on day: 20040117 channel ORA_DISK_1: autobackup found: c-1052178311-20040117-01 channel ORA_DISK_1: SPFILE restore from autobackup complete Finished restore at 17-JAN-04
RMAN> exit
Recovery Manager complete. [oracle@jumper bdump]$ ls -l /tmp/spfileeygle.ora -rw-r----- 1 oracle dba 3584 1月 17 09:34 /tmp/spfileeygle.ora |
你同样可以通过这种方法恢复控制文件,示例如下:
[oracle@jumper bdump]$ rman target /
Recovery Manager: Release 9.2.0.3.0 - Production
Copyright (c) 1995, 2002, Oracle Corporation. All rights reserved.
connected to target database: HSJF (DBID=1052178311)
RMAN> restore controlfile to '/tmp/control01.ctl' from autobackup;
Starting restore at 17-JAN-04
using target database controlfile instead of recovery catalog allocated channel: ORA_DISK_1 channel ORA_DISK_1: sid=10 devtype=DISK channel ORA_DISK_1: looking for autobackup on day: 20040117 channel ORA_DISK_1: autobackup found: c-1052178311-20040117-02 channel ORA_DISK_1: controlfile restore from autobackup complete Finished restore at 17-JAN-04
RMAN> exit
Recovery Manager complete. [oracle@jumper bdump]$ ls -l /tmp/control* -rw-r----- 1 oracle dba 1892352 1月 17 09:44 /tmp/control01.ctl |
Oracle9i自动备份控制文件的功能给我们带来了极大的收益,通过自动备份,在数据库出现紧急状况的时候,你可能可以从这个自动备份中获得更为有效及时的控制文件.
缺省的,这个自动备份功能是关闭的,你可以用我们上面提到的方法打开该功能.
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