This graphic shows a flow chart of the typical steps you will have to perform to upgrade your Oracle Database to Oracle Database 11g (126.96.36.199). It is not meant to be a thorough description of each step, but an outline you can follow, as long as you refer to the Oracle Database upgrade documentation for the details.
In summary, the steps involve the following:
If you are starting from Oracle Database Oracle9i Release 2 (9.2) or Oracle Database 10g, then you must install Oracle Database 11g (188.8.131.52) and then apply the Oracle Database 11g (184.108.40.206) patch set.
If you are starting from Oracle Database 11g, then you must apply the Oracle Database 11g (220.127.116.11) patch set.
After you have installed the Oracle Database 11g (18.104.22.168) patch set, you can then run the Database Upgrade Assistant.