[r1dba@INPRJ-HOTV9V01 ~]$ sqlplus /nolog
SQL*Plus: Release 12.2.0.1.0 Production on Mon Mar 11 16:04:01 2019
Copyright (c) 1982, 2016, Oracle. All rights reserved.
SQL> conn r1dba/*********
ERROR:
ORA-12547: TNS:lost contact
SQL> exit
[r1dba@INPRJ-HOTV9V01 ~]$ su - 12cdb
Password:
Last login: Mon Mar 11 16:01:22 IST 2019 from 10.14.255.207 on pts/3
[12cdb@INPRJ-HOTV9V01 ~]$ cd $ORACLE_HOME/bin
[12cdb@INPRJ-HOTV9V01 bin]$ ls -ltr oracle
-rwxrwxrwx. 1 12cdb oinstall 407988856 Feb 18 12:12 oracle
[12cdb@INPRJ-HOTV9V01 bin]$ chmod 6751 oracle
[12cdb@INPRJ-HOTV9V01 bin]$ exit
logout
[r1dba@INPRJ-HOTV9V01 ~]$ sqlplus /nolog
SQL*Plus: Release 12.2.0.1.0 Production on Mon Mar 11 16:07:01 2019
Copyright (c) 1982, 2016, Oracle. All rights reserved.
SQL> conn r1dba/*********
Connected.
For more possible reasons and solutions.
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