Summary Encountered problem cannot login Oracle by login name and password “system/oracle”, resolved this issue by changed the kernal parameter kernel.sem in sysctl.conf. Problem Encountered ORA-01034 and ORA-27101 as below, [tom@ocp ~]$ [tom@ocp ~]$ sqlplus /nolog SQL*Plus: Release 11.2.0.1.0 Production on 星期四 12月 20 20:42:24 2018 Copyright (c) 1982, 2009, Oracle. All rights reserved. SQL> […]