Trigger: Copy Pfile From Spfile With Date After Startup Db

CREATE OR REPLACE TRIGGER copy_spfile

AFTER STARTUP ON DATABASE
DECLARE
cPath CONSTANT varchar2(80) := 'E:\oracle\admin\ORCL\pfile';
BEGIN
EXECUTE IMMEDIATE
'create pfile='''||cPath||'\init.ora.'|| TO_CHAR(SYSDATE,'yyyymmdd_hh24mi')||''' from spfile';
EXCEPTION
WHEN others THEN NULL;
END;