Deinstall 12.2 Grid Infratructure

                    Last month I have updated the blog with deinstall 12c database (http://sajidkhadarabad.blogspot.com/2018/07/deinstall-12c-database.html), today lets see how we can deinstall grid infrastructure 12.2.0.1. It is imperative to clean the grid software properly, if you are trying to install the new grid software on the existing machine, if not you will be seeing more discrepancies with the new install.

      Let's start working on the process, make sure you set your environment profiles right. I am performing this on a two node RAC cluster, make sure you read and answer the prompts right.


[grid@sajidserver01 deinstall]$ pwd
/usr/12.2/grid/deinstall
[grid@sajidserver01 deinstall]$ ls -ltr
-rwxr-x--- 1 grid oinstall 11313 Jun 18 15:56 deinstall

The deconfig command below can be executed in parallel on all the remote nodes. 

Execute the command on  the local node after the execution completes on all the remote nodes.

Run the following command as the root user or the administrator on node "sajidserver02".

/usr/12.2/grid/crs/install/rootcrs.sh -force -deconfig -paramfile "/tmp/deinstall2018-06-22_12-29-38PM/response/deinstall_OraGI12Home1.rsp"

Run the following command as the root user or the administrator on node "sajidserver01".

/usr/12.2/grid/crs/install/rootcrs.sh -force  -deconfig -paramfile "/tmp/deinstall2018-06-22_12-29-38PM/response/deinstall_OraGI12Home1.rsp" -lastnode

Press Enter after you finish running the above commands

 It will deinstall the software but the directories will still be existing across all the nodes. Which you need to manually delete.

      

Deinstall 12c Database

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.

It will deinstall the software but the directories will still be existing across all the nodes. Which you need to manually delete.