The following procedure is for Non-RAC environment and in the below example I am rolling back July 2016 PSU :

Double check that under $ORACLE_HOME/rdbms/admin

that there is a file with the naming convention catbundle_PSU_DBSID_ROLLBACK.sql

If this file doesn’t exist then you need to execute the following:

cd $ORACLE_HOME/rdbms/admin

sqlplus /nolog

SQL> CONNECT / AS SYSDBA

SQL> STARTUP

SQL> @catbundle.sql psu apply

SQL> @utlrp.sql

SQL> QUIT

 

Shutdown the database

SQL> shutdown immediate;

Execute opatch utility to rollback the patch:

opatch rollback -id 23054359

Remark: the patch number 23054359 is supplied with HTML document that comes with the patch downloaded.

cd $ORACLE_HOME/rdbms/admin

SQL> CONNECT / AS SYSDBA

SQL> STARTUP

SQL> @catbundle_PSU_ORAT772_ROLLBACK.sql

SQL> @utlrp.sql

SQL> QUIT

For Java component:

Shutdown the database

SQL> shutdown immediate;

 

Execute opatch utility to roll back the patch:

opatch rollback -id 23177551

cd $ORACLE_HOME/sqlpatch/23177551

 

SQL> CONNECT / AS SYSDBA

SQL> startup upgrade

SQL> @postdeinstall.sql

SQL> shutdown

SQL> startup

SQL> @utlrp.sql

SQL> QUIT