I will be discussing on deinstalling the 12c database, if you would like to drop the database check this (http://sajidkhadarabad.blogspot.com/2016/06/delete-or-drop-oracle-database-12c.html). Make sure you set your Oracle database profiles properly. This one is particularly for 12cR2 RAC database, the process will be the same for even 12cR1 and 11G databases.
[oracle@sajidserver01 deinstall]$ pwd
/usr/oracle/product/12.2/deinstall
[oracle@sajidserver deinstall]$ ls -ltr deinstall
-rwxr-x--- 1 oracle oinstall 11323 Jul 19 11:59 deinstall
In the below screenshot, it will ask you to feed in the details after few steps. I have highlighted them for easy understanding.
[oracle@sajidserver01 deinstall]$ pwd
/usr/oracle/product/12.2/deinstall
[oracle@sajidserver deinstall]$ ls -ltr deinstall
-rwxr-x--- 1 oracle oinstall 11323 Jul 19 11:59 deinstall
In the below screenshot, it will ask you to feed in the details after few steps. I have highlighted them for easy understanding.
It will deinstall the software but the directories will still be existing across all the nodes. Which you need to manually delete.
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