[oracle@jtwy02 ~]$ sqlplus ‘/as sysdba‘
SQL*Plus: Release 11.2.0.4.0 Production on Sat Oct 13 14:14:13 2018
Copyright (c) 1982, 2013, Oracle. All rights reserved.
ERROR:
ORA-00020: maximum number of processes (150) exceeded
解决方法：[root@oracle 11g ~]$ps -ef|grep "oracleXXXX (LOCAL=NO)"|grep -v grep|awk ‘{print $2}‘|xargs kill -9
重新登录数据库
SP2-0157: unable to CONNECT to ORACLE after 3 attempts, exiting SQL*Plus
原文：https://www.cnblogs.com/JIKes/p/9782798.html