--linux系统下从/proc中找回误删除的控制文件
SYS@PROD3> select name from v$controlfile;
NAME
----------------------------------------------------------------------------------------------------
/home/oracle/db1/control01.ctl
SYS@PROD3> !rm -rf /home/oracle/db1/control01.ctl --模拟删除
SYS@PROD3> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
[oracle@ocm1 ~]$ exit
logout
[root@ocm1 ~]# lsof |grep /home/oracle/db1/control01.ctl --lsof(list open files)是一个列出当前系统打开文件的工具
oracle 3954 oracle 256u REG 253,0 9519104 11075755 /home/oracle/db1/control01.ctl (deleted)
oracle 3956 oracle 256u REG 253,0 9519104 11075755 /home/oracle/db1/control01.ctl (deleted)
oracle 3958 oracle 256uW REG 253,0 9519104 11075755 /home/oracle/db1/control01.ctl (deleted)
oracle 3964 oracle 258u REG 253,0 9519104 11075755 /home/oracle/db1/control01.ctl (deleted)
oracle 3998 oracle 257u REG 253,0 9519104 11075755 /home/oracle/db1/control01.ctl (deleted)
[root@ocm1 ~]# cd /proc/3954/fd/ --/proc/N/fd 包含进程相关的所有的文件描述符
[root@ocm1 fd]# ll
total 0
lr-x------ 1 oracle oinstall 64 Mar 18 20:41 0 -> /dev/null
l-wx------ 1 oracle oinstall 64 Mar 18 20:41 1 -> /dev/null
lr-x------ 1 oracle oinstall 64 Mar 18 20:41 10 -> /dev/zero
lr-x------ 1 oracle oinstall 64 Mar 18 20:41 11 -> /dev/zero
lrwx------ 1 oracle oinstall 64 Mar 18 20:41 12 -> /u01/app/oracle/product/11.2.0/dbhome_1/dbs/hc_PROD3.dat
lr-x------ 1 oracle oinstall 64 Mar 18 20:41 13 -> /u01/app/oracle/product/11.2.0/dbhome_1/rdbms/mesg/oraus.msb
lr-x------ 1 oracle oinstall 64 Mar 18 20:41 14 -> /proc/3954/fd
lr-x------ 1 oracle oinstall 64 Mar 18 20:41 15 -> /dev/zero
lrwx------ 1 oracle oinstall 64 Mar 18 20:41 16 -> /u01/app/oracle/product/11.2.0/dbhome_1/dbs/hc_PROD3.dat
lrwx------ 1 oracle oinstall 64 Mar 18 20:41 17 -> /u01/app/oracle/product/11.2.0/dbhome_1/dbs/lkPROD3
l-wx------ 1 oracle oinstall 64 Mar 18 20:41 2 -> /dev/null
lr-x------ 1 oracle oinstall 64 Mar 18 20:41 20 -> /u01/app/oracle/product/11.2.0/dbhome_1/rdbms/mesg/oraus.msb
lrwx------ 1 oracle oinstall 64 Mar 18 20:41 256 -> /home/oracle/db1/control01.ctl (deleted)
lrwx------ 1 oracle oinstall 64 Mar 18 20:41 257 -> /home/oracle/db1/system01.dbf
lrwx------ 1 oracle oinstall 64 Mar 18 20:41 258 -> /home/oracle/db1/sysaux01.dbf
lrwx------ 1 oracle oinstall 64 Mar 18 20:41 259 -> /home/oracle/db1/undotbs01.dbf
lrwx------ 1 oracle oinstall 64 Mar 18 20:41 260 -> /home/oracle/db1/users01.dbf
lrwx------ 1 oracle oinstall 64 Mar 18 20:41 261 -> /home/oracle/db1/t1.dbf
lrwx------ 1 oracle oinstall 64 Mar 18 20:41 262 -> /home/oracle/db1/temp01.dbf
lr-x------ 1 oracle oinstall 64 Mar 18 20:41 3 -> /dev/null
lr-x------ 1 oracle oinstall 64 Mar 18 20:41 4 -> /dev/null
lr-x------ 1 oracle oinstall 64 Mar 18 20:41 5 -> /dev/null
lr-x------ 1 oracle oinstall 64 Mar 18 20:41 6 -> /dev/null
lrwx------ 1 oracle oinstall 64 Mar 18 20:41 7 -> /u01/app/oracle/product/11.2.0/dbhome_1/dbs/hc_PROD3.dat
lr-x------ 1 oracle oinstall 64 Mar 18 20:41 8 -> /dev/null
lr-x------ 1 oracle oinstall 64 Mar 18 20:41 9 -> /dev/null
[root@ocm1 fd]# cp -v 256 /home/oracle/db1/control01.ctl
`256' -> `/home/oracle/db1/control01.ctl'
[root@ocm1 fd]# chown oracle:oinstall /home/oracle/db1/control01.ctl
[root@ocm1 fd]# su - oracle
[oracle@ocm1 ~]$ export ORACLE_SID=PROD3
[oracle@ocm1 ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.3.0 Production on Sat Mar 18 20:43:16 2017
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SYS@PROD3> startup force
ORACLE instance started.
Total System Global Area 958341120 bytes
Fixed Size 1348972 bytes
Variable Size 281021076 bytes
Database Buffers 671088640 bytes
Redo Buffers 4882432 bytes
Database mounted.
Database opened.
