Oracle 监听hang住

无论是执行lsnrctl stop,lsnrctl reload,lsnrctl stop一直都是卡住最后报错，最后做重新配置，奇怪的是在删除原有的监听那一步就一直是卡住，最后弹出error

这让我很匪夷所思，万能的重启重建都失灵了。。。数据库重启也是一样，监听文件进行删除重建还是一个样，草民很是难过。。。

查看了监听日志大小，这数据库一直处于空闲状态，按理说监听日志应该很小，但不放过任何一个细节，结果没啥发现：

[oracle@db trace]$ pwd
/u01/app/oracle/diag/tnslsnr/db/listener/trace
[oracle@db trace]$ ls
listener.log
[oracle@db trace]$ du -h
3.0M .
[oracle@db trace]$

仔细看了之前发现一个关键点：

为啥这里没有显示主机名或IP，难道是主机名个主机IP的映射关系出错了，结果果然，IP已是192.168.43.20，但HOSTS文件没有同步。

改后：

监听正常启动

[oracle@db ~]$ lsnrctl status

LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 24-AUG-2019 12:28:24

Copyright (c) 1991, 2013, Oracle. All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=db)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.4.0 - Production
Start Date 24-AUG-2019 12:28:16
Uptime 0 days 0 hr. 0 min. 7 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/db/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=db)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
The listener supports no services
The command completed successfully
[oracle@db ~]$ clear
[oracle@db ~]$ lsnrctl status

LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 24-AUG-2019 12:28:47

Copyright (c) 1991, 2013, Oracle. All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=db)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.4.0 - Production
Start Date 24-AUG-2019 12:28:16
Uptime 0 days 0 hr. 0 min. 31 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/db/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=db)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
Services Summary...
Service "orcl" has 1 instance(s).
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
[oracle@db ~]$

 Toad 正常连接：

Oracle 监听hang住

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