Re write Update statement

Question

Hi All,
I need to re-write below update statement. existing one is taking long time to update. Please help me on that. thanks in advance
UPDATE xxx a
SET a.bb = 'NG',
a.cc = '12'
WHERE EXISTS (
SELECT 1
FROM dt , lm
WHERE dt.ln_dt = (SELECT MAX (insert_date)
FROM ccc
WHERE source_system_id = 36)
AND dt.id = 36
AND dt.ln = a.ln
AND lm.lnr = dt.ln
AND NVL (lm.ind, 'XX') <> 'NG')
AND (
NOT EXISTS(
SELECT 1
FROM mt, lp
WHERE mt.ln=a.ln
AND lp.ln=a.ln
AND a.dt IS NOT NULL
AND mt.m_id = 1
AND lp.p_date >= trunc(sysdate,'mon')
AND EXISTS(
SELECT 1
FROM my_view p
WHERE p.ln = a.ln
AND p.pay_dt > TRUNC(ADD_MONTHS(SYSDATE, -3),'mon')
AND p.past_due > 29)
);

Answer 1

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