Oracle 12c Cheat Sheet

Quick Check

Listner status

lsnrctl status

It must display services (XE or E1Local in this case) :

LSNRCTL for Linux: Version 12.1.0.2.0 - Production on 06-OCT-2014 20:46:10

Copyright (c) 1991, 2014, Oracle.  All rights reserved.

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 12.1.0.2.0 - Production
Start Date                06-OCT-2014 17:19:19
Uptime                    0 days 3 hr. 26 min. 50 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Log File         /u01/app/oracle/diag/tnslsnr/vmsvr075/listener/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=vmsvr075)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=vmsvr075)(PORT=5500))(Security=(my_wallet_directory=/u01/app/oracle/admin/E1Local/xdb_wallet))(Presentation=HTTP)(Session=RAW))
Services Summary...
Service "E1Local" has 1 instance(s).
  Instance "E1Local", status READY, has 1 handler(s) for this service...
Service "E1LocalXDB" has 1 instance(s).
  Instance "E1Local", status READY, has 1 handler(s) for this service...
The command completed successfully

If the listner is not running you get:

LSNRCTL for Linux: Version 12.1.0.2.0 - Production on 06-OCT-2014 20:48:54

Copyright (c) 1991, 2014, Oracle.  All rights reserved.

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
TNS-12541: TNS:no listener
 TNS-12560: TNS:protocol adapter error
  TNS-00511: No listener
   Linux Error: 111: Connection refused

To start the listner:

 lsnrctl start

Wait 1 / 2 minutes to rerun lsnrctl status This waiting time might be necessary for the listner to "discover" the database.

Create Dabase

Create Database dbca : in /u01/app/oracle/product/12.1.0/dbhome_1/bin/