RE: Performance tuning

Markus,

Your english is fine!

There should be an index on the following tables/columns

	SUPLOT-> LOT_TIP_LOT
	RECPLA-> PLA_IDE_EMP, PLA_FOL_LOT (concatenated index)
	

Also, you may try rewriting the WHERE clause on the 2nd part of the query as:

FROM RECPLA
WHERE PLA_IDE_EMP ='10004918'
AND (Pla_fol_lot = '0' OR

       NOT EXISTS (SELECT 1
                   FROM   suplot
                   WHERE  lot_tip_lot IN ('12', '13')
                   AND    recpla.pla_fol_lot = lot_tip_lot));

Hope this helps.

Kevin
>
> hi gurus ....sorry im trying to optimize this query ...
> unfortunately it takes nearly 20 seconds .....(it's a lot) ...
> recpla --> 800000 records
> Suplot --> 100000 records ...
>
> SELECT PLA_FOL_LOT,
> PLA_FOL_PLA,PLA_PER_DEV_REM,PLA_IDE_EMP,PLA_FEC_CAJ,PLA_TOT_OBL_INF,
> PLA_TOT_VOL_INF,PLA_TOT_APO_EMP_INF,
> PLA_TOT_APO_SEG_INF,PLA_TOT_COM_POR_INF,
> PLA_PER_DEV_REM,decode(lot_num_pro,'140','AC','PN') status
> ,PLA_IND_TIP_PLA
> FROM RECPLA, Suplot
> WHERE PLA_IDE_EMP ='10004918'
> and Pla_fol_lot = lot_fol_lot
> and (lot_tip_lot = '12' or lot_tip_lot = '13')
> union all
> SELECT pla_fol_lot,
> PLA_FOL_PLA,PLA_PER_DEV_REM,PLA_IDE_EMP,PLA_FEC_CAJ,PLA_TOT_OBL_INF,
> PLA_TOT_VOL_INF,PLA_TOT_APO_EMP_INF,
> PLA_TOT_APO_SEG_INF,PLA_TOT_COM_POR_INF,
> PLA_PER_DEV_REM,decode(pla_fol_lot,'0','PN','AC') status
> ,PLA_IND_TIP_PLA
> FROM RECPLA
> WHERE PLA_IDE_EMP ='10004918'
> and ( Pla_fol_lot = '0' OR
> Pla_fol_lot not in (select lot_fol_lot from suplot
> where (lot_tip_lot =
> '12' or lot_tip_lot = '13') )
> );
>
Received on Wed Nov 08 2000 - 11:48:52 CST