How to uninstall oracle11g from win10

OS- Windows10 64-bits

steps:-1

Uninstall all Oracle components using the Oracle Universal Installer (OUI).
Go to deinstall scripts location
C:\app\oracle\product\11.2.0\dbhome_1\deinstall

double click on deinstall symble.

open new command prompt.

Steps-2

Press window key with R-key
Open window than Run regedit.exe and delete the HKEY_LOCAL_MACHINE/SOFTWARE/Oracle key.

This contains registry entries for all Oracle products.

If you are running 64-bit Windows, 
you should also delete the HKEY_LOCAL_MACHINE/SOFTWARE/Wow6432Node/Oracle key if it exists.
Delete any references to Oracle services left behind in the following part of the registry
(HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Ora*).

It should be pretty obvious which ones relate to Oracle.


Steps-3
Reboot your machine.

Delete the "C:\Oracle" directory, or whatever directory is your ORACLE_BASE.

Delete the "C:\Program Files\Oracle" directory.

If you are running 64-bit Wiindows, you should also delete the "C:\Program Files (x86)\Oracle" directory.

Remove any Oracle-related subdirectories from the "C:\ProgramData\Microsoft\Windows\Start Menu\Programs\" directory.

Empty the contents of your "C:\temp" directory.

Empty your recycle bin.

At this point your machine will be as clean of Oracle components as it can be without a complete OS reinstall.

Remember, manually editing your registry can be very destructive and force an OS reinstall so only do it as a last resort.

If some DLLs can't be deleted, try renaming them, the after a reboot delete them.


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OS:- OEL6.5

Uninstalling all products from OEL is a lot more consistent.
If you do need to resort to a manual uninstall you should do something like:

Uninstall all Oracle components using the Oracle Universal Installer (OUI).
Stop any outstanding processes using the appropriate utilities.

# oemctl stop oms user/password
# agentctl stop
# lsnrctl stop

Alternatively you can kill them using the kill -9 pid command as the root user.
Delete the files and directories below the $ORACLE_HOME.

# cd $ORACLE_HOME
# rm -Rf *

With the exception of the product directory, delete directories below the $ORACLE_BASE.

# cd $ORACLE_BASE
# rm -Rf admin doc jre o*

Delete the /etc/oratab file. If using 9iAS delete the /etc/emtab file also.

# rm /etc/oratab /etc/emtab