Please tune my query.It took 17 sec for execution
SELECT grirno, grirdate
FROM grirmain
WHERE grirno NOT IN
(SELECT grirno
FROM grir_pass
WHERE ins_check IS NOT NULL AND grirdate > '01-apr-2013')
AND grirno IS NOT NULL
AND chkuser IS NOT NULL
AND grirdate > '01-apr-2013'
ORDER BY TO_NUMBER (SUBSTR (GRIRNO,INSTR (GRIRNO,'/',1,1)+ 1,( INSTR (GRIRNO,'/',1,2)- INSTR (GRIRNO,'/',1,1)- 1))) DESC
I recommend writing this using NOT EXISTS
:
SELECT m.grirno, m.grirdate
FROM grirmain m
WHERE NOT EXISTS (SELECT 1
FROM grir_pass p
WHERE g.grirno = p.grirno AND
p.ins_check IS NOT NULL AND
p.grirdate > DATE '2018-04-01'
) AND
m.grirno IS NOT NULL AND
m.chkuser IS NOT NULL AND
m.grirdate > DATE '2018-04-01'
ORDER BY TO_NUMBER(SUBSTR (GRIRNO,INSTR (GRIRNO,'/',1,1)+ 1,( INSTR (GRIRNO,'/',1,2)- INSTR (GRIRNO,'/',1,1)- 1))) DESC;
Then, you want indexes on grir_pass(grirno, grirdate, ins_check)
and grirmain(grirno, grirdate, chkuser)
.