-24969: ERR_XPDIRTY - param file is dirty 

Explanation:

An attempt has been made to make a change to the kernel parameters without first checking whether or not a previous change works properly by restarting the database.

User action:

Restart the database and change the parameters again.

Restarting the database so that it is OFFLINE breaks the connection to all users logged on to the database or ends all programs that are running on it.