Você pode fazer isso em um loop e conceder por SQL dinâmico:
BEGIN
FOR objects IN
(
SELECT 'GRANT ALL ON "'||owner||'"."'||object_name||'" TO MyUser' grantSQL
FROM all_objects
WHERE owner = 'MY_SCHEMA'
AND object_type NOT IN
(
--Ungrantable objects. Your schema may have more.
'SYNONYM', 'INDEX', 'INDEX PARTITION', 'DATABASE LINK',
'LOB', 'TABLE PARTITION', 'TRIGGER'
)
ORDER BY object_type, object_name
) LOOP
BEGIN
EXECUTE IMMEDIATE objects.grantSQL;
EXCEPTION WHEN OTHERS THEN
--Ignore ORA-04063: view "X.Y" has errors.
--(You could potentially workaround this by creating an empty view,
-- granting access to it, and then recreat the original view.)
IF SQLCODE IN (-4063) THEN
NULL;
--Raise exception along with the statement that failed.
ELSE
raise_application_error(-20000, 'Problem with this statement: ' ||
objects.grantSQL || CHR(10) || SQLERRM);
END IF;
END;
END LOOP;
END;
/
