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DBCA : No Protocol specified



when trying to execute dbca from linux terminal got this error message.

now execute the command xhost, you probably receiving
No protocol specified
xhost:  unable to open display ":0"


issue is your user is not allowed to access the x server.
You can use xhost to limit access for X server for security reasons.

probably you are logged in as oracle user. switch back to default user and execute xhost again. you should see
something like SI:localuser:nuwan

solution is adding the oracle to access control list
xhost +SI:localuser:oracle

now go back to oracle user and try dbca
it should be working

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