Need to be tuned the script

Question

Hello
Any suggestions in tuning following script.
SET LINESIZE 178
SPOOL &1
PROMPT @@ &2
PROMPT @@ &3
PROMPT @@ &4
SELECT
LPAD(a.lief_nr, 5,' ')
|| LPAD(a.iln_nr,13,' ')
|| a.lief_art
|| a.art_list_kz
|| a.art_ean_kz
|| a.distri_radius
|| a.import_sl
|| a.werb_verre_kz
|| a.loesch_kz
|| a.sperr_kz
|| a.edi_kz
|| LPAD(NVL(TO_CHAR(a.lief_dsd_nr), ' '),7,' ')
|| LPAD(NVL(a.ums_st_id,'@'),14,' ')
|| LPAD(NVL(TO_CHAR(a.vertrag_dat,'DDMMYYYY'),' '),8,' ')
|| LPAD(NVL(TO_CHAR(b.lml_lief_nr),' '),5,' ')
|| LPAD(NVL(TO_CHAR(c.w11_adr_sl),' '),9,' ')
|| SUBSTR(DECODE(c.match_name, NULL, LPAD(' ', 40, ' '), LPAD(c.match_name,40,' ')||LPAD(c.match_name,40,' ')), 1, 40)
|| SUBSTR(DECODE(c.match_ort, NULL, LPAD(' ', 15, ' '), LPAD(c.match_ort,15,' ')||LPAD(c.match_ort,15,' ')), 1, 15)
|| c.neu_list_kz
|| LPAD(d.lts_nr, 2,' ')
|| SUBSTR(DECODE(d.lts_bez, NULL, LPAD(' ', 33, ' '), LPAD(d.lts_bez,33,' ')||LPAD(d.lts_bez,33,' ')), 1, 33)
|| LPAD(d.urb_eksg,3,' ')
|| ' '
|| LPAD(NVL(TO_CHAR(e.zahl_ziel),' '),3,' ')
|| LPAD(NVL(TO_CHAR(e.sdr_zahl_tage),' '),3,' ')
FROM LI_ALLG a,
( SELECT lief_nr, lml_lief_nr, gueltig_bis
FROM LI_KONZERN_LIEF
WHERE (lief_nr, gueltig_bis) IN
(SELECT lief_nr, MAX(gueltig_bis) gueltig_bis
FROM LI_KONZERN_LIEF
GROUP BY lief_nr)
AND to_char(sysdate, 'YYYY') - to_char(gueltig_bis, 'YYYY') < 3
AND gueltig_ab <= sysdate
) b,
LI_LIEFERANT c,
LI_LTS_ALLG d,
( SELECT lief_nr, lts_nr, zahl_ziel, sdr_zahl_tage
FROM LI_LTS_ZAHLUNG
WHERE (lief_nr, lts_nr, gueltig_ab) IN
( SELECT lief_nr, lts_nr, max(gueltig_ab)
FROM LI_LTS_ZAHLUNG
GROUP BY lief_nr, lts_nr
AND to_char(sysdate, 'YYYY') - to_char(gueltig_bis, 'YYYY') < 3
AND gueltig_ab <= sysdate
) e
WHERE
c.lief_nr=a.lief_nr
AND (a.lief_nr, a.gueltig_bis) IN
(SELECT lief_nr, max(gueltig_bis)
from LI_ALLG
where to_char(sysdate, 'YYYY') - to_char(gueltig_bis, 'YYYY') < 3
and gueltig_ab <= sysdate
group by lief_nr
AND c.lief_nr=b.lief_nr(+)
AND c.lief_nr=d.lief_nr
AND (d.lief_nr, d.gueltig_bis) IN
(SELECT lief_nr, max(gueltig_bis)
from LI_LTS_ALLG
where to_char(sysdate, 'YYYY') - to_char(gueltig_bis, 'YYYY') < 3
and gueltig_ab <= sysdate
group by lief_nr
AND a.lief_nr = e.lief_nr(+)
AND e.lts_nr = d.lts_nr
PROMPT @@@ THE END

Answer 1

Can you post the execution plan for this query?
Also,
Oracle Version
Number of records in tables/returned by sub-queries
Edit: There are condition checks which go as
TO_CHAR (SYSDATE, 'YYYY') - TO_CHAR (gueltig_bis, 'YYYY') < 3
These could be rewritten as following, if there were any indexes defined on Gueltig_bis column
gueltig_bis between to_char (sysdate, 'YYYY')-2 and to_char (SYSDATE, 'yyyy')