Followed below two guidelines
http://www.oracle-base.com/articles/12c/upgrading-to-12c.php
http://allthingsoracle.com/upgrade-to-oracle-database-12c-single-instance/
1. Install oracle12c binaries on existing 11g DB
2. Use Manual Method to upgrade DB
3. below are the reults.
SQL> SELECT CDB FROM V$DATABASE; CDB --- NO SQL> COLUMN NAME FORMAT A8 SQL> SELECT NAME, CON_ID, DBID, CON_UID, GUID FROM V$CONTAINERS ORDER BY CON_ID; NAME CON_ID DBID CON_UID GUID -------- ---------- ---------- ---------- -------------------------------- ecdb 0 2690860943 0 0357A41433776FF0E0538B06A8C088FF
But my problem is that there is no CDB or PDB as you have seen in above query
what to do next !!!