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If you are using 11gR2, please follow the below steps.
De-installing Oracle Home using home deinstall utility
1- Go to the $ORACLE_HOME/deinstall folder.
2- Invoke deinstall utility.
3- Answer the questions it asks interactively. Typical questions are;
-Specify all Single Instance listeners that are to be de-configured:
-Specify the list of database names that are configured in this Oracle home:
-Specify the type of this database (1.Single Instance Database|2.Oracle Restart Enabled Database)
-Specify the diagnostic destination location of the database
-Specify the storage type used by the Database
-Specify the list of directories if any database files exist on a shared file system. If 'upgrade' subdirectory is found, then it will be deleted. Otherwise, the specified directory will be deleted. Alternatively, you can specify list of database files with full path
-Specify the flash recovery area location, if it is configured on the file system. If 'upgrade' subdirectory is found, then it will be deleted.
-Specify the database spfile location
4- After taking all inputs, it will start de-install operation. Logs will be created under <central_inventory>/logs folder
5- After successful completion check if inventory is updated properly.
6- Check if OracleHome folder is deleted. If not then you have to remove it manually.
If you are using 11gR1, use the below steps
1. Launch OUI from $ORACLE_HOME/bin
2. Click on Installed Products
3. Select the Oracle Home and remove it