How to reduce buffer gets

Question

Dear All,
My query is taking 575,618,610, executions 86,114 and CPU Time is 3982.59s which i found in the statspack report.
Then i checked the query to tune, but it's execution plan is showing only CPU cost 5.
So, what is the problem and what is the solution. Please let me know.
Thanks in advance
Mahi

Answer 1

Hi Richard Foote,
The below is the function, in that i am using a cursor with the SQL in Bold letters.
That SQL query is taking more buffer gets as i expalined previously.
FUNCTION get_shortcuts(
p_org_id IN VARCHAR2,
p_usr_id IN VARCHAR2,
p_sws_id IN VARCHAR2,
p_lan_id IN VARCHAR2)
RETURN pglobal.g_ref_cur
AS
c_1 pglobal.g_ref_cur;
BEGIN
IF NVL(p_lan_id, 'ENG') = 'ENG' THEN
OPEN c_1
FOR
SELECT amnu.url_value, swssh.sws_id_1, sws.title
FROM SOFTWARE_SERVICE_SHORTCUTS swssh, SERVICE_PROVISIONS sp, SOFTWARE_SERVICES sws, APPLICATION_MENUS amnu
WHERE swssh.sws_id = p_sws_id
AND swssh.sws_id_1 = sp.sws_id
AND sp.rol_org_id = p_org_id
AND sp.sws_id = sws.id
AND sws.id = swssh.sws_id_1
AND sws.sws_id = amnu.sws_id
AND EXISTS(SELECT rol_id
FROM USER_ROLES
WHERE rol_org_id = p_org_id
AND usr_id = p_usr_id
AND rol_id = sp.rol_id); ELSE
OPEN c_1
FOR
SELECT sws.url_value, swssh.sws_id_1, sws.title
FROM SOFTWARE_SERVICE_SHORTCUTS swssh,
SERVICE_PROVISIONS sp,
SOFTWARE_SERVICES sws,
SOFTWARE_SERVICE_LANGUAGES swsl
WHERE swssh.sws_id = p_sws_id
AND swssh.sws_id_1 = sp.sws_id
AND swsl.sws_id = sws.id
AND swsl.lan_id = p_lan_id
AND sp.rol_id = p_org_id
AND sp.sws_id = sws.id
AND EXISTS(SELECT rol_id
FROM USER_ROLES
WHERE rol_org_id = p_org_id
AND usr_id = p_usr_id
AND rol_id = sp.rol_id)
GROUP BY sws.url_value, swssh.sws_id_1, sws.title;
END IF;
RETURN c_1;
END;
So, please can u explain me is there any possiblity to reduce the buffer gets after checking the above function.
Thanks in advance
Mahi