共计 6535 个字符，预计需要花费 17 分钟才能阅读完成。
本篇内容介绍了“修改 hostname 后导致 oracle 客户端无法连接怎么办”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让丸趣 TV 小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
虚拟机 centos7 中刚装了 oracle11g，没重启前一切正常
重启后发现客户端无法连接到数据库了
SQL*Plus: Release 11.2.0.1.0 Production on 星期五 11 月 16 15:05:18 2018
Copyright (c) 1982, 2010, Oracle. All rights reserved.
请输入用户名: system@orcl
输入口令:
ERROR:
ORA-12541: TNS: 无监听程序 登陆服务器看一下监听状态
[root@lzr ~]# lsnrctl status
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 16-NOV-2018 15:07:55
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date 16-NOV-2018 15:00:14
Uptime 0 days 0 hr. 7 min. 45 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /data/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File /data/oracle/diag/tnslsnr/lzr/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))
Services Summary...
Service ORCL has 1 instance(s).
Instance ORCL , status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully实例 ORCL 状态为 UNKNOWN, 有点不太懂了，百度了一下之后
解决办法
发现可能是 hostname 出现了问题
我在重启之前用命令
#hostnamectl set-hostname lzr修改过 hostname
先打开 /etc/hosts 检查一下
[root@lzr ~]# vi /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6host 文件解释
添加新的一行
[root@lzr ~]# vi /etc/hosts
127.0.0.1 lzr
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6然后 wq 保存退出
现在我将数据库重启
[root@lzr ~]# sqlplus
SQL*Plus: Release 11.2.0.1.0 Production on Fri Nov 16 15:25:52 2018
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Enter user-name: sys as sysdba
Enter password:
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL startup
ORACLE instance started.
Total System Global Area 1185853440 bytes
Fixed Size 2212776 bytes
Variable Size 738200664 bytes
Database Buffers 436207616 bytes
Redo Buffers 9232384 bytes
Database mounted.
Database opened.再将监听重启，查看状态
[root@lzr ~]# lsnrctl
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 16-NOV-2018 15:31:17
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Welcome to LSNRCTL, type help for information.
LSNRCTL stop
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))
The command completed successfully
LSNRCTL start
Starting /data/oracle/product/11.2.0/db_1/bin/tnslsnr: please wait...
TNSLSNR for Linux: Version 11.2.0.1.0 - Production
System parameter file is /data/oracle/product/11.2.0/db_1/network/admin/listener.ora
Log messages written to /data/oracle/diag/tnslsnr/lzr/listener/alert/log.xml
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=lzr)(PORT=1521)))
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date 16-NOV-2018 15:31:21
Uptime 0 days 0 hr. 0 min. 5 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /data/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File /data/oracle/diag/tnslsnr/lzr/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=lzr)(PORT=1521)))
Services Summary...
Service ORCL has 1 instance(s).
Instance ORCL , status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
LSNRCTL status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date 16-NOV-2018 15:31:21
Uptime 0 days 0 hr. 0 min. 8 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /data/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File /data/oracle/diag/tnslsnr/lzr/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=lzr)(PORT=1521)))
Services Summary...
Service ORCL has 1 instance(s).
Instance ORCL , status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully好像和之前没有什么变化
去数据库中注册一下监听
[root@lzr ~]# sqlplus
SQL*Plus: Release 11.2.0.1.0 Production on Fri Nov 16 15:32:54 2018
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Enter user-name: sys as sysdba
Enter password:
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL alter system register
2 ;
System altered.再出来查看一下监听状态
[root@lzr ~]# lsnrctl
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 16-NOV-2018 15:33:35
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Welcome to LSNRCTL, type help for information.
LSNRCTL status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date 16-NOV-2018 15:31:21
Uptime 0 days 0 hr. 2 min. 15 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /data/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File /data/oracle/diag/tnslsnr/lzr/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=lzr)(PORT=1521)))
Services Summary...
Service ORCL has 2 instance(s).
Instance ORCL , status UNKNOWN, has 1 handler(s) for this service...
Instance orcl , status READY, has 1 handler(s) for this service...
Service orclXDB has 1 instance(s).
Instance orcl , status READY, has 1 handler(s) for this service...
The command completed successfully看上去正常了,status ready
现在回到客户端中测试一下连接
C:\Users\lzr sqlplus
SQL*Plus: Release 11.2.0.1.0 Production on 星期五 11 月 16 15:34:10 2018
Copyright (c) 1982, 2010, Oracle. All rights reserved.
请输入用户名: system@orcl
输入口令:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL show user
USER 为 SYSTEM可以正常使用客户端连接了
“修改 hostname 后导致 oracle 客户端无法连接怎么办”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注丸趣 TV 网站，丸趣 TV 小编将为大家输出更多高质量的实用文章！
正文完
发表至： 数据库
2023-08-01
![Frank#smith[Kfyzeiuqujbpygze,2,5]](https://cravatar.cn/avatar/ebd2642d86a4b40100d29dc76ec89b0d?s=96&d=monsterid&r=r)
