Did you finished reading my post on 12c upgrade?
Power of rot, obscuring truth, what once was old restore to youth – http://en.wikipedia.org/wiki/Visionaries:_Knights_of_the_Magical_Light
Just like that – my database is back to 11.2.0.3
[oracle@lax:db01]/u01/app/oracle/cfgtoollogs/dbua/lax_db01/upgrade1 $ ls *restore* db01_restore.sh [oracle@lax:db01]/u01/app/oracle/cfgtoollogs/dbua/lax_db01/upgrade1 $ ./db01_restore.sh -- Bringing down the database from the new oracle home SQL*Plus: Release 12.1.0.1.0 Production on Tue Jul 2 18:53:14 2013 Copyright (c) 1982, 2013, Oracle. All rights reserved. Connected. ORACLE instance shut down. Disconnected from Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 - 64bit Production With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options You should Remove this entry from the /etc/oratab: db01:/u01/app/oracle/product/12.1.0/dbhome_1:Y -- Bringing up the database from the source oracle home You should Add this entry in the /etc/oratab: db01:/u01/app/oracle/product/11.2.0.3/db_1:Y -- Removing /u01/app/oracle/cfgtoollogs/dbua/logs/Welcome_db01.txt file SQL*Plus: Release 11.2.0.3.0 Production on Tue Jul 2 18:53:17 2013 Copyright (c) 1982, 2011, Oracle. All rights reserved. Connected to an idle instance. File created. Disconnected SQL*Plus: Release 11.2.0.3.0 Production on Tue Jul 2 18:53:18 2013 Copyright (c) 1982, 2011, Oracle. All rights reserved. Connected to an idle instance. ORACLE instance started. Total System Global Area 534462464 bytes Fixed Size 2230072 bytes Variable Size 167774408 bytes Database Buffers 360710144 bytes Redo Buffers 3747840 bytes Database mounted. Flashback complete. Database altered. Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options [oracle@lax:db01]/u01/app/oracle/cfgtoollogs/dbua/lax_db01/upgrade1 $ vi /etc/oratab [oracle@lax:db01]/u01/app/oracle/cfgtoollogs/dbua/lax_db01/upgrade1 $ . ~/.bash_profile [oracle@lax:db01]/u01/app/oracle/cfgtoollogs/dbua/lax_db01/upgrade1 $ db01 The Oracle base remains unchanged with value /u01/app/oracle IPC Resources for ORACLE_SID "db01" : Shared Memory: ID KEY 26116100 0x00000000 26148869 0x00000000 26181638 0xc1f92260 Semaphores: ID KEY 2228226 0x7632ce48 Oracle Instance alive for sid "db01" [oracle@lax:db01]/u01/app/oracle/cfgtoollogs/dbua/lax_db01/upgrade1 $ sqlplus "/ as sysdba" SQL*Plus: Release 11.2.0.3.0 Production on Tue Jul 2 19:00:44 2013 Copyright (c) 1982, 2011, Oracle. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options LAX:(SYS@db01)> exit Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options [oracle@lax:db01]/u01/app/oracle/cfgtoollogs/dbua/lax_db01/upgrade1 $ lsnrctl status listener_db01 LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 02-JUL-2013 19:00:56 Copyright (c) 1991, 2011, Oracle. All rights reserved. Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=lax.localdomain)(PORT=1531)(SEND_BUF_SIZE=32767)(RECV_BUF_SIZE=32767))) STATUS of the LISTENER ------------------------ Alias listener_db01 Version TNSLSNR for Linux: Version 11.2.0.3.0 - Production Start Date 02-JUL-2013 06:39:35 Uptime 0 days 12 hr. 21 min. 22 sec Trace Level off Security ON: Local OS Authentication SNMP OFF Listener Parameter File /u01/app/oracle/product/11.2.0.3/db_1/network/admin/listener.ora Listening Endpoints Summary... (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=lax)(PORT=1531))) Services Summary... Service "lax_db01" has 1 instance(s). Instance "db01", status UNKNOWN, has 1 handler(s) for this service... The command completed successfully [oracle@lax:db01]/u01/app/oracle/cfgtoollogs/dbua/lax_db01/upgrade1 $
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