Limit no of rows in complex query

Question

Hi,
I have below cursor query for which I need to limit no of rows retrieved to a certain value say 5000.
I'm getting full table scan on table ltc_iss_rec if I do not specify a range
for ltc_iss_rec.
Thq query purpose get ref nos whose lc expiry date is less than or equal to
sysdate -15.
The max query below is also giving higher cost .
Question si how to limit rows in cursor without using a range for ltc_iss_rec_id.
The primary key in ltc_iss_rec is (ltc_iss_rec_id,psd_serial_num)
Index in ltc_iss_rec is (ltc_iss_rec_id,lc_expr_dt)
The primary key in psd is (psd_id,psd_serial_no)
primary key in psd_link is (psd_id,psd_serial_no,link_psd_id,link_psd_ser_no)
Index in psd_link is (link_psd_id,link_psd_ser_no)
Index on psd_lcs is (update_serial_no)
primary key on (psd_lcs) is (psd_id,psd_serial_no,other columns)
SELECT MIN(ltc_iss_rec_id)
INTO l_min_ltc_iss_rec_id
FROM ltc_iss_rec
WHERE lc_expr_dt <= ADD_MONTHS(SYSDATE,-15);
SELECT MAX(ltc_iss_rec_id)
INTO l_max_ltc_iss_rec_id
FROM
SELECT ltc_iss_rec_id
FROM ltc_iss_rec
WHERE ltc_iss_rec_id >= l_min_ltc_iss_rec_id
ORDER BY ltc_iss_rec_id
WHERE ROWNUM < l_iwh_arch_cnt;
OPEN txn_ref_cur FOR
SELECT b.ltc_iss_rec_id,b.psd_serial_num,a.sys_id,a.cosmos_ref_no,
a.src_sys_asgn_ref_no,a.bank_id,b.lc_expr_dt
FROM psd a,ltc_iss_rec b
WHERE b.ltc_iss_rec_id >= l_min_ltc_iss_rec_id
AND b.ltc_iss_rec_id <= l_max_ltc_iss_rec_id
-- and b.lc_expr_dt <= add_months(sysdate,-15)
AND a.psd_id = b.ltc_iss_rec_id
AND a.psd_serial_no = b.psd_serial_num
AND a.psd_typ_cod = 'ISS'
AND a.psd_serial_no =
SELECT NVL(MAX(link_psd_ser_no),'000') FROM psd_link c,psd_lcs d
WHERE c.psd_id = d.psd_id
AND c.psd_serial_no = d.psd_serial_num
AND c.link_psd_id = a.psd_id
AND c.link_psd_id BETWEEN l_min_ltc_iss_rec_id AND l_max_ltc_iss_rec_id
AND d.update_serial_num = (
SELECT MAX(f.update_serial_num) FROM psd_link e, psd_lcs f
WHERE e.psd_id = f.psd_id
AND e.psd_serial_no = f.psd_serial_num
AND e.link_psd_id = a.psd_id
ORDER BY b.ltc_iss_rec_id;

Answer 1

Try using Analytic function row_number().
Regards
RK