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You are eligible to upgrade to 220.127.116.11 as long as you are paying for maintenance/support on 18.104.22.168.
As you stated, you will have to install 22.214.171.124 in a new ORACLE_HOME, then follow the steps in the README to perform the upgrade.
Important Changes to Oracle Database Patch Sets Starting With 126.96.36.199 [ID 1189783.1]
After a successful upgrade, you can de-install the 188.8.131.52 software by following the documentation - http://docs.oracle.com/cd/E11882_01/install.112/e24321/remove_oracle_sw.htm#CEGBAJIA
Thanks for reply......
Suppose I am keeping old Oracle Home for safer side and installing new Oracle Home on another mount point.
So waht will happen to existing '/etc/oratab' and '/etc/oraInst.loc' file?
It will be overwrited or new files will created?
If it is overwriting that old files then at the time deinstallation of old Oracle home it can remove new Oracle home's files....
No there is no impact for new ORACLE_HOME (184.108.40.206) installed when you perform deinstall of old ORACLE_HOME (220.127.116.11).
Generally its not advisable to deinstall till you feel post upgrade the database is stable. If you need to use the old ORACLE_HOME for some reasons you will be with no options but to perform install again or copy from some other location.