This article mainly shares with you how to start Oracle under Linux, hoping to help everyone.
1. Steps to start Oracle
Starting Oracle under Linux is divided into the following two steps:
1.1. Start lsnrctl monitoring.
#1.2. Start the database instance.
2. Start oracle monitoring
First log in to the server and switch to oracle user.
<span style="font-family: 微软雅黑, "Microsoft YaHei"; font-size: 14px;">[admin@dataserver ~]$ su - oracle<br/>密码：<br/>[oracle@dataserver ~]$<br/></span>
Next, check the running status of the oracle listener and view it through the lsnrctl status command.
If the oracle monitoring is not started, execute the following to start monitoring, pass the command lsnrctl start, the results are as follows:
Above The feedback is that the monitoring startup failed because the IP 30.85.227.24 it is monitoring is not the IP of the server, so this IP needs to be adjusted to the current IP of the server.
Under the oracle user, enter the directory /u01/app/oracle/product/11.2.0/dbhome_1/network/admin and modify the listener.ora file. Note that this directory varies depending on the specific server. 
listener.ora file opens. The content is as follows. Just adjust the HOST IP in it.
After adjusting the listening IP, restart the listener and execute lsnrctl start
At this point, the oracle listener is started successfully!
3. Start the oracle instance
Log in to oracle as the system user
<span style="font-family: 微软雅黑, "Microsoft YaHei"; font-size: 14px;">[oracle@dataserver admin]$ sqlplus /nolog<br/><br/>SQL*Plus: Release 11.2.0.1.0 Production on 星期五 4月 15 15:23:04 2016<br/>Copyright (c) 1982, 2009, Oracle. All rights reserved.<br/><br/>SQL> conn as sysdba<br/>Enter user-name: system<br/>Enter password: <br/>Connected to an idle instance.0<br/></span>
Then start the instance through the startup command:
<span style="font-family: 微软雅黑, "Microsoft YaHei"; font-size: 14px;">SQL> startup<br/>ORACLE instance started.<br/><br/>Total System Global Area 4.0620E+10 bytes<br/>Fixed Size 2216024 bytes<br/>Variable Size 2.3354E+10 bytes<br/>Database Buffers 1.7180E+10 bytes<br/>Redo Buffers 84054016 bytes<br/>Database mounted.<br/>Database opened.<br/>SQL> <br/><br/></span>
4. Close the oracle instance
Through shutdown Command to shut down the oracle instance.
<span style="font-family: 微软雅黑, "Microsoft YaHei"; font-size: 14px;">SQL> shutdown<br/>Database closed.<br/>Database dismounted.<br/>ORACLE instance shut down.<br/>SQL> <br/></span>
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