监听报这个错误
$ lsnrctl status
LSNRCTL for IBM/AIX RISC System/6000: Version 11.2.0.4.0 - Production on 26-MAR-2020 02:43:06
Copyright (c) 1991, 2013, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER)))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
IBM/AIX RISC System/6000 Error: 79: Connection refused
解决方式：
/etc/hosts 添加 localhost
