What are definer and invoker rights in database, Oracle and MySQL?
Let's take a simple example:
You have this procedure using &quot;definer rights&quot; - which is the default in Oracle.
CREATE PROCEDURE DEL_EMP AS
BEGIN
   DELETE FROM EMP;
END;

Another user who calls this procedure only needs EXECUTE privilege for this procedure, it is not required that such user has DELETE privilege on table EMP.
Procedure runs under permission of the procedure owner (or user who defined it, thus it is called &quot;definer&quot; rights).
&quot;Inovker Rights&quot; is the opposite. A user who likes to runs this procedure successfully must have EXECUTE privilege for this procedure and DELETE privilege for table EMP.
There are some more points regarding definer and invoker rights but for a general understanding this should be enough.