1、进入sqlplus里面：
[oracle@master ~]$ sqlplus / as sysdba
SQL*Plus: Release 12.1.0.2.0 Production on Tue Dec 25 15:06:28 2018
Copyright (c) 1982, 2014, Oracle. All rights reserved.
Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options
SQL> alter user sys identified by admin;
User altered.
SQL> conn sys/admin as sysdba;
Connected.
SQL> alter user system identified by admin;
User altered.
连接plsql时，首要起监听
[oracle@master ~]$ lsnrctl start
查看监听状态：
[oracle@master ~]$ lsnrctl status
LSNRCTL for Linux: Version 12.1.0.2.0 - Production on 25-DEC-2018 15:14:55
Copyright (c) 1991, 2014, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=master)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 12.1.0.2.0 - Production
Start Date 25-DEC-2018 15:03:27
Uptime 0 days 0 hr. 11 min. 28 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/12.1.0/db_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/master/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=master)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=master)(PORT=5500))(Security=(my_wallet_directory=/u01/app/oracle/admin/orcl/xdb_wallet))(Presentation=HTTP)(Session=RAW))
Services Summary...
Service "orcl" has 2 instance(s).
Instance "ORCL", status UNKNOWN, has 1 handler(s) for this service...
Instance "shenlan", status READY, has 1 handler(s) for this service...
Service "pdborcl" has 1 instance(s).
Instance "shenlan", status READY, has 1 handler(s) for this service...
Service "shenlanXDB" has 1 instance(s).
Instance "shenlan", status READY, has 1 handler(s) for this service...
The command completed successfully
《完》