Index not used - why?
Hi,
I build a SQL-Report with this Statement:
SELECT wb_mitarbeiter, wb_datum, wb_zeit, wb_kennzeichen, wb_ziel,
sb_mitarbeiter, sb_datum, sb_zeit, sb_kennzeichen, sb_ziel,
DECODE (wb_kennzeichen - sb_kennzeichen, 0, '', 'Diff') flag
FROM lgs_items_org
WHERE (sb_datum >= :p14_von OR -1 = :p14_von)
AND (sb_datum <= :p14_bis OR -1 = :p14_bis)
AND sb_mitarbeiter > 0
AND (wb_mitarbeiter = :p14_wb_ma OR -1 = :p14_wb_ma)
ORDER BY wb_datum ASC, wb_zeit ASC
The result is correct, but a full table scan is performed, no index is used and needs very much time.
In SQL*Plus I run this statement (:P14_von + :P14_bis replaced):
SELECT wb_mitarbeiter, wb_datum, wb_zeit, wb_kennzeichen, wb_ziel,
sb_mitarbeiter, sb_datum, sb_zeit, sb_kennzeichen, sb_ziel,
DECODE (wb_kennzeichen - sb_kennzeichen, 0, '', 'Diff') flag
FROM lgs_items_org
WHERE sb_mitarbeiter > 0
AND (sb_datum >= '20051122' OR -1 = '20051122')
AND (sb_datum <= '20051122' OR -1 = '20051122')
AND (wb_mitarbeiter = :p14_wb_ma OR -1 = :p14_wb_ma)
ORDER BY wb_datum ASC, wb_zeit ASC
Here an index is used. The result is correct and very fast.
1) Why is the index?
and
2) How can I change the statement, to use the index?
Thanks for any idea!
Regards,
Frank
Thanks for your help! Thanks for the book-tip!
I got it. The problem is the where-part.
and (wb_mitarbeiter = :Pxy OR -1 = :Pxy) does NOT use an index, because the 2.part of the OR does not use an indexed column.
But and wb_mitarbeiter = :Pxy (without the OR part) uses the index.
My solution: I changed the sql-structured Query into a PL/SQL-Function-Body Report (a little bit longer :-( )
declare
q varchar2(5000);
begin
q := 'select NAME||'' - '' ||WB_MITARBEITER WB_MITARBEITER';
q := q||', to_char(to_date(WB_DATUM,''YYYYMMDD''),''DD.MM.YYYY'') "DATUM WB"';
q := q||', WB_ZEIT, WB_KENNZEICHEN WB_KZ, WB_ZIEL';
q := q||', SB_MITARBEITER';
q := q||', to_char(to_date(SB_DATUM,''YYYYMMDD''),''DD.MM.YYYY'') "DATUM SB"';
q := q||', SB_ZEIT, SB_KENNZEICHEN SB_KZ, SB_ZIEL';
q := q||', DECODE(WB_KENNZEICHEN - SB_KENNZEICHEN,0,'''',''Diff'') Flag';
q := q||' from wwcontrol.LGS_ITEMS_ORG, wwcontrol.LGS_PERSONAL_ORG';
q := q||' where SB_MITARBEITER > 0 AND WB_MITARBEITER = PINNR';
if :P14_VON <> -1 THEN
q := q||' and SB_DATUM >= :P14_VON ';
end if;
if :P14_BIS <> -1 THEN
q := q||' and SB_DATUM <= :P14_BIS ';
end if;
if :P14_WB_MA <> -1 THEN
q := q||' and WB_MITARBEITER = :P14_WB_MA ';
end if;
if :P14_DIFF = 1 THEN
q := q||' and WB_KENNZEICHEN - SB_KENNZEICHEN <> 0';
end if;
q := q||' order by WB_DATUM asc, WB_ZEIT asc';
return q;
end;
Is there a way to do this smarter?
Regards,
Frank
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Justin
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