记一次DG搭建过程中备库ORA-00210，ORA-00202，ORA-27086错误

ORA-00210: cannot open the specified control file

ORA-00202: control file:
'/u01/app/oracle/oradata/orcl/control01.ctl'

ORA-27086: unable to lock file - already in use

思路：

1、看一下"lk" and "sgadef.dbf"这两个文件是不是存在着，如果存在将其删掉；

2、看是不是有后台进程存在；

3、看一下oracle的共享内存段及信号集(semaphores)是不是还存在着；

实际操作：

[oracle@linux ~]$ cd
$ORACLE_HOME/dbs

[oracle@linux dbs]$ ls

hc_SID.dat initdw.ora
init.ora lkSID orapwSID spfileSID.ora

[oracle@linux dbs]$ rm lkSID

[oracle@linux dbs]$ ls

hc_SID.dat initdw.ora
init.ora orapwSID spfileSID.ora

[oracle@linux dbs]$ ps -ef|grep
ora_|grep SID

oracle
4981 1 0 09:00
? 00:00:00 ora_pmon_SID

oracle
4983 1 0 09:00
? 00:00:00 ora_psp0_SID

oracle
4985 1 0 09:00
? 00:00:00 ora_mman_SID

oracle
4987 1 0 09:00
? 00:00:00 ora_dbw0_SID

oracle
4989 1 0 09:00
? 00:00:00 ora_lgwr_SID

oracle
4991 1 0 09:00
? 00:00:01 ora_ckpt_SID

oracle
4993 1 0 09:00
? 00:00:01 ora_smon_SID

oracle
4995 1 0 09:00
? 00:00:00 ora_reco_SID

oracle
4997 1 0 09:00
? 00:00:00 ora_cjq0_SID

oracle
4999 1 0 09:00
? 00:00:07 ora_mmon_SID

oracle
5001 1 0 09:00
? 00:00:00 ora_mmnl_SID

oracle
5003 1 0 09:00
? 00:00:00 ora_d000_SID

oracle
5005 1 0 09:00
? 00:00:00 ora_s000_SID

oracle
5023 1 0 09:00
? 00:00:00 ora_qmnc_SID

oracle
5133 1 0 09:00
? 00:00:00 ora_q000_SID

oracle
5139 1 0 09:00
? 00:00:00 ora_q001_SID

oracle
31755 1 1 13:21
? 00:00:00 ora_j000_SID

[oracle@linux dbs]$ ps -ef|grep
ora_|grep SID|grep pmon

oracle
4981 1 0 09:00
? 00:00:00 ora_pmon_SID

[oracle@linux dbs]$ kill -9 4981

[oracle@linux dbs]$ ps -ef|grep
ora_|grep SID|grep pmon

[oracle@linux dbs]$ ipcs -m

------ Shared Memory Segments
--------

key
shmid owner
perms bytes
nattch status

重新startup数据库，问题解决。