Oracle控制文件多路复用以及Oracle备份重建控制文件
2014-11-20 16:11
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控制文件中记录了oracle数据库的物理结构,也就是记录了数据库数据文件和日志文件的位置,控制文件中还记录了多种SCN,用这些SCN来确定数据文件和日志文件是否是正确的。如果不正确那么数据库就需要恢复 启动数据库有三个状态 nomount 加载参数文件启动实例 mount 加载控制文件 open 根据控制文件加载数据文件和日志文件
一、Oracle控制文件多路复用
查询控制文件路径
SYS@zwcdb:~>SELECT name FROM v$controlfile;
NAME
--------------------------------------------------------------------------------
/u01/app/oracle/oradata/primarydb/control01.ctl
/u01/app/oracle/oradata/primarydb/control02.ctl
/u01/app/oracle/oradata/primarydb/control03.ctl
修改spfile
SYS@zwcdb:~>ALTER system SET control_files=
2 '/u01/app/oracle/oradata/primarydb/control01.ctl',
3 '/u01/app/oracle/oradata/primarydb/control02.ctl',
4 '/u01/app/oracle/oradata/primarydb/control03.ctl',
5 '/u01/app/control04.ctl' scope=spfile;
System altered.
关闭数据库,复制控制文件至/u01/app下
SYS@zwcdb:~>shutdown immediate
DATABASE closed.
DATABASE dismounted.
ORACLE instance shut down.
SYS@zwcdb:~>exit
Disconnected FROM Oracle DATABASE 10g Enterprise Edition Release 10.2.0.1.0 - Production
WITH the Partitioning, OLAP AND DATA Mining options
[oracle@zwc ~]$ cp /u01/app/oracle/oradata/primarydb/control01.ctl /u01/app/control04.ctl
重新启动数据库并验证
[oracle@zwc ~]$ sqlplus / AS sysdba
SQL*Plus: Release 10.2.0.1.0 - Production ON Fri Jan 6 10:35:05 2012
Copyright (c) 1982, 2005, Oracle. ALL rights reserved.
Connected TO an idle instance.
SYS@zwcdb:~>startup
ORACLE instance started.
Total System Global Area 285212672 bytes
Fixed SIZE 1218992 bytes
Variable SIZE 92276304 bytes
DATABASE Buffers 188743680 bytes
Redo Buffers 2973696 bytes
DATABASE mounted.
DATABASE opened.
SYS@zwcdb:~>
SYS@zwcdb:~>SELECT name FROM v$controlfile;
NAME
--------------------------------------------------------------------------------
/u01/app/oracle/oradata/primarydb/control01.ctl
/u01/app/oracle/oradata/primarydb/control02.ctl
/u01/app/oracle/oradata/primarydb/control03.ctl
/u01/app/control04.ctl
SYS@zwcdb:~>SELECT VALUE FROM v$spparameter WHERE name='control_files';
VALUE
--------------------------------------------------------------------------------
/u01/app/oracle/oradata/primarydb/control01.ctl
/u01/app/oracle/oradata/primarydb/control02.ctl
/u01/app/oracle/oradata/primarydb/control03.ctl
/u01/app/control04.ctl
二、Oracle备份重建控制文件
建议在数据文件或者日志文件发生变化时对控制文件进行备份,在这之前备份的控制文件会被标记为已过时。 可以使用alter database bacup controlfile命令进行备份,备份方式有两种,一种是备份为二进制文件;另一种是备份为脚本文件
将控制文件备份到二进制文件
SYS@zwcdb:~>alter database backup controlfile to '/u01/app/control.bak.ctl';
Database altered.
SYS@zwcdb:~>!ls -lh /u01/app/control*
-rw-r----- 1 oracle oinstall 6.8M Jan 6 10:52 /u01/app/control04.ctl
-rw-r----- 1 oracle oinstall 6.8M Jan 6 10:51 /u01/app/control.bak.ctl
控制文件转储为脚本
SYS@zwcdb:~>oradebug setmypid
Statement processed.
SYS@zwcdb:~>ALTER DATABASE backup controlfile TO trace;
DATABASE altered.
SYS@zwcdb:~>oradebug tracefile_name
/u01/app/oracle/admin/primarydb/udump/zwcdb_ora_3401.trc
查看zwcdb_ora_3401.trc文件内容会发现以下两段脚本,区别在于第一段是noresetlogs,第二段是resetlogs。这里日志组不需要重建,所以将使用noresetlogs
MAXLOGFILES 16 表示最大日志文件个数为16
MAXLOGMEMBERS 3 表示日志文件组的成员是3个
MAXDATAFILES 100 表示最大的数据文件个数是100
MAXINSTANCES 8 表示最大实例个数是8
MAXLOGHISTORY 292 表示最大的历史日志文件个数是292
CREATE CONTROLFILE REUSE DATABASE "ZWCDB" NORESETLOGS ARCHIVELOG
MAXLOGFILES 16
MAXLOGMEMBERS 3
MAXDATAFILES 100
MAXINSTANCES 8
MAXLOGHISTORY 292
LOGFILE
GROUP 1 '/u01/app/oracle/oradata/primarydb/redo01.log' SIZE 50M,
GROUP 2 '/u01/app/oracle/oradata/primarydb/redo02.log' SIZE 50M,
GROUP 3 '/u01/app/oracle/oradata/primarydb/redo03.log' SIZE 50M
-- STANDBY LOGFILE
DATAFILE
'/u01/app/oracle/oradata/primarydb/system01.dbf',
'/u01/app/oracle/oradata/primarydb/undotbs01.dbf',
'/u01/app/oracle/oradata/primarydb/sysaux01.dbf',
'/u01/app/oracle/oradata/primarydb/users01.dbf',
'/u01/app/oracle/oradata/primarydb/example01.dbf'
CHARACTER SET ZHS16GBK
;
resetlogs
CREATE CONTROLFILE REUSE DATABASE "ZWCDB" RESETLOGS ARCHIVELOG
MAXLOGFILES 16
MAXLOGMEMBERS 3
MAXDATAFILES 100
MAXINSTANCES 8
MAXLOGHISTORY 292
LOGFILE
GROUP 1 '/u01/app/oracle/oradata/primarydb/redo01.log' SIZE 50M,
GROUP 2 '/u01/app/oracle/oradata/primarydb/redo02.log' SIZE 50M,
GROUP 3 '/u01/app/oracle/oradata/primarydb/redo03.log' SIZE 50M
-- STANDBY LOGFILE
DATAFILE
'/u01/app/oracle/oradata/primarydb/system01.dbf',
'/u01/app/oracle/oradata/primarydb/undotbs01.dbf',
'/u01/app/oracle/oradata/primarydb/sysaux01.dbf',
'/u01/app/oracle/oradata/primarydb/users01.dbf',
'/u01/app/oracle/oradata/primarydb/example01.dbf'
CHARACTER SET ZHS16GBK
;
模拟控制文件丢失
[oracle@zwc app]$ rm -rf control04.ctl
[oracle@zwc app]$ rm -rf /u01/app/oracle/oradata/primarydb/control0*
[oracle@zwc app]$ sqlplus / AS sysdba
SQL*Plus: Release 10.2.0.1.0 - Production ON Fri Jan 6 11:02:55 2012
Copyright (c) 1982, 2005, Oracle. ALL rights reserved.
Connected TO:
Oracle DATABASE 10g Enterprise Edition Release 10.2.0.1.0 - Production
WITH the Partitioning, OLAP AND DATA Mining options
SYS@zwcdb:~>shutdown abort
ORACLE instance shut down.
重建控制文件
[oracle@zwc app]$ sqlplus / AS sysdba
SQL*Plus: Release 10.2.0.1.0 - Production ON Fri Jan 6 11:07:00 2012
Copyright (c) 1982, 2005, Oracle. ALL rights reserved.
Connected TO an idle instance.
SYS@zwcdb:~>startup nomount
ORACLE instance started.
Total System Global Area 285212672 bytes
Fixed SIZE 1218992 bytes
Variable SIZE 92276304 bytes
DATABASE Buffers 188743680 bytes
Redo Buffers 2973696 bytes
SYS@zwcdb:~>CREATE CONTROLFILE REUSE DATABASE "ZWCDB" NORESETLOGS ARCHIVELOG
2 MAXLOGFILES 16
3 MAXLOGMEMBERS 3
4 MAXDATAFILES 100
5 MAXINSTANCES 8
6 MAXLOGHISTORY 292
7 LOGFILE
8 GROUP 1 '/u01/app/oracle/oradata/primarydb/redo01.log' SIZE 50M,
9 GROUP 2 '/u01/app/oracle/oradata/primarydb/redo02.log' SIZE 50M,
10 GROUP 3 '/u01/app/oracle/oradata/primarydb/redo03.log' SIZE 50M
11 DATAFILE
12 '/u01/app/oracle/oradata/primarydb/system01.dbf',
13 '/u01/app/oracle/oradata/primarydb/undotbs01.dbf',
14 '/u01/app/oracle/oradata/primarydb/sysaux01.dbf',
15 '/u01/app/oracle/oradata/primarydb/users01.dbf',
16 '/u01/app/oracle/oradata/primarydb/example01.dbf'
17 CHARACTER SET ZHS16GBK
18 ;
Control file created.
SYS@zwcdb:~>RECOVER DATABASE;
Media recovery complete.
SYS@zwcdb:~>ALTER SYSTEM ARCHIVE LOG ALL;
System altered.
SYS@zwcdb:~>ALTER DATABASE OPEN;
DATABASE altered.
SYS@zwcdb:~>ALTER TABLESPACE TEMP ADD TEMPFILE '/u01/app/oracle/oradata/primarydb/temp01.dbf'
2 SIZE 20971520 REUSE AUTOEXTEND ON NEXT 655360 MAXSIZE 32767M;
Tablespace altered.
[oracle@zwc ~]$ sqlplus / AS sysdba
SQL*Plus: Release 10.2.0.1.0 - Production ON Fri Jan 6 11:12:42 2012
Copyright (c) 1982, 2005, Oracle. ALL rights reserved.
Connected TO:
Oracle DATABASE 10g Enterprise Edition Release 10.2.0.1.0 - Production
WITH the Partitioning, OLAP AND DATA Mining options
SYS@zwcdb:~>SELECT open_mode,log_mode FROM v$database;
OPEN_MODE LOG_MODE
---------- ------------
READ WRITE ARCHIVELOG
SYS@zwcdb:~>SELECT name FROM v$controlfile;
NAME
--------------------------------------------------------------------------------
/u01/app/oracle/oradata/primarydb/control01.ctl
/u01/app/oracle/oradata/primarydb/control02.ctl
/u01/app/oracle/oradata/primarydb/control03.ctl
/u01/app/control04.ctl
SYS@zwcdb:~>!ls /u01/app/control*
/u01/app/control04.ctl /u01/app/control.bak.ctl
SYS@zwcdb:~>!ls $ORACLE_BASE/oradata/primarydb/con*
/u01/app/oracle/oradata/primarydb/control01.ctl /u01/app/oracle/oradata/primarydb/control02.ctl /u01/app/oracle/oradata/primarydb/control03.ctl
SYS@zwcdb:~>conn scott/tiger@zwcdb
Connected.
SCOTT@zwcdb:~>SELECT tname FROM tab;
TNAME
------------------------------
DEPT
EMP
BONUS
SALGRADE
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