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oracle 15950 1 0 15:50 ? 00:00:00 ora_reco_ora11g
oracle 15952 1 0 15:50 ? 00:00:00 ora_mmon_ora11g
oracle 15954 1 0 15:50 ? 00:00:00 ora_mmnl_ora11g
oracle 15956 1 0 15:50 ? 00:00:00 ora_d000_ora11g
oracle 15958 1 0 15:50 ? 00:00:00 ora_s000_ora11g
oracle 15966 1 0 15:50 ? 00:00:00 ora_qmnc_ora11g
oracle 15980 1 0 15:50 ? 00:00:00 ora_cjq0_ora11g
oracle 15982 1 0 15:50 ? 00:00:00 ora_q000_ora11g
oracle 15984 1 0 15:50 ? 00:00:00 ora_q001_ora11g
建库后监听检查:
lsnrctlstatus
[oracle@DB_m2 database]$ lsnrctl status
LSNRCTL for Linux: Version11.2.0.1.0 - Production on 06-MAR-2016 15:55:31
Copyright (c) 1991, 2009,Oracle. All rights reserved.
Connecting to(DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
STATUS of the LISTENER ------------------------
Alias LISTENER Version TNSLSNR for Linux: Version11.2.0.1.0 - Production
Start Date 06-MAR-2016 15:36:22
Uptime 0 days 0 hr. 19 min. 8 sec Trace Level off
Security ON: Local OS Authentication SNMP OFF
Listener Parameter
File /opt/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora
Listener Log
File /opt/app/oracle/diag/tnslsnr/DB_2/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521))) (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=DB_m2)(PORT=1521))) Services Summary...
Service \
Instance \Service\
Instance \The command completedsuccessfully
如果出现以下错误:
lsnrctl: error while loading shared
libraries:/u01/app/oracle/product/11.2.0/db_1/lib/libclntsh.so.11.1: cannotrestoresegmentprot after reloc: Permission denied 或者
ORA-12547: TNS:lost contact
解决办法：在root用户下执行以下命令
su - root
setenforce 0 不需要重启
修改/etc/selinux/config文件中的SELINUX=\为 disabled ，需要重启
注意：如果在没有将依赖包全部安装完成后强行安装数据库，那么登录数据库时将会出现：ORA-12547: TNS:lost contact错误，出现这个错误，就重新安装吧
修改oracle启动配置文件:
su - oracle vi /etc/oratab
orcl:/soft/u01/app/oracle/product/11.2.0/db_1:Y //把“N”改成“Y” 这样就可以通过dbstart启动此实例，监听器。
dbstart $ORACLE_HOME
此时所有oracle的进程关闭，监听器也停止。
dbshut $ORACLE_HOME 再次查看监听器状态。 lsnrctlstatus
启动数据库:
$ sqlplus / as sysdba //as前有个空格
[oracle@DB_m2 database]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Sun Mar 616:22:55 2016 Copyright (c) 1982, 2009, Oracle. All rights reserved. ERROR:
ORA-12162: TNS:netservice name is incorrectly specified Enter user-name:
登录出现以上错误，诡异的故障背后的原因竟然是那样的基础：ORACLE_SID没有指定！
确认系统当前的ORACLE_HOME和ORACLE_SID环境变量
[oracle@DB_m2 database]$ echo $ORACLE_HOME /opt/app/oracle/product/11.2.0/dbhome_1 [oracle@DB_m2 database]$ echo $ORACLE_SID
[oracle@DB_m2 database]$
可见，此时只设置了ORACLE_HOME环境变量，但ORACLE_SID此时为空，这就是该问题的真实原因。 解决方法如下：
[oracle@DB_m2 database]$ cd [oracle@DB_m2 ~]$ pwd /home/oracle
[oracle@DB_m2 ~]$ vi .bash .bash_history .bash_profile .bash_logout .bashrc [oracle@DB_m2 ~]$ vi .bash_
.bash_history .bash_logout .bash_profile
[oracle@DB_m2 ~]$ vi .bash_profile 在最后面加入如下内容:
export ORACLE_SID=ora11g 后保存退出! [oracle@DB_m2 ~]$ source .bash_profile [oracle@DB_m2 ~]$ echo $ORACLE_SID ora11g
[oracle@DB_m2 ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.1.0Production on Sun Mar 6 16:31:46 2016 Copyright (c) 1982, 2009,Oracle. All rights reserved.
Connected to:
Oracle Database 11g EnterpriseEdition Release 11.2.0.1.0 - 64bit Production With the Partitioning, OLAP, DataMining and Real Application Testing options SQL>start SQL>startup
ORACLE instance started.
Total System Global Area 304807936 bytes
Fixed Size 2212856 bytes Variable Size 113249288 bytes Database Buffers 184549376 bytes Redo Buffers 4796416 bytes Database mounted. Database opened.