Query response time takes more time when calling from package

Question

SELECT
/* UTILITIES_PKG.GET_COUNTRY_CODE(E.EMP_ID,E.EMP_NO) COUNTRY_ID */
(SELECT DISTINCT IE.COUNTRY_ID
FROM DOCUMENT IE
WHERE IE.EMP_ID =E.EMP_ID
AND IE.EMP_NO = E.EMP_NO
AND IE.STATUS = 'OPEN' ) COUNTRY_ID
FROM EMPLOYEE E
CREATE OR REPLACE PACKAGE BODY UTILITIES_PKG AS
FUNCTION GET_COUNTRY_CODE(P_EMP_ID IN VARCHAR2, P_EMP_NO IN VARCHAR2)
RETURN VARCHAR2 IS
L_COUNTRY_ID VARCHAR2(25) := '';
BEGIN
SELECT DISTINCT IE.COUNTRY_ID
INTO L_COUNTRY_ID
FROM DOCUMENT IE
WHERE IE.EMP_ID = P_EMP_ID
AND IE.EMP_NO = P_EMP_NO
AND IE.STATUS = 'OPEN';
RETURN L_COUNTRY_ID;
EXCEPTION
WHEN OTHERS THEN
RETURN 'CONT';
END;
END UTILITIES_PKG;
when I run above query its coming in 1.2 seconds.but when comment subquery and call from package its taking 9 seconds.query returns more than 2000 records.i am not able to find the reason why it is taking more time when calling from package?

Answer 1

You are getting a different plan when you run it as PL/SQL most likely. Comment your statement:
SELECT /* your comment here */then find them in V$SQL and get the SQL IDs. You can then use DBMS_XPLAN.DISPLAY_CURSOR to see what is actually happening.
http://www.psoug.org/reference/dbms_xplan.html