IN Toad 9,while executing 'SET DEFINE OFF;' I am getting error as 'ORA-00922: missing or invalid option'
Alternatively, you can do this:
Navigate to View
> TOAD Options
> And go to "execute/compile" node/item
and uncheck the Prompt for substitution variables
option.
Or, for editor level change, Right click in the editor and uncheck Prompt for substitution variables