Peformance tuning

Question

hi experts
i have got stuck in performance tuning osf one query
how can i tune this query by breaking it into two parts
  SELECT a~vguid
         b~vbeln
         b~posnr
         b~charg
         b~bwtar
         c~kunnr
         b~kwmeng
         INTO TABLE i_sales
         FROM vlccuorder AS a
         INNER JOIN vbap AS b
         ON ( avbeln EQ bvbeln
         AND  aposnr EQ bposnr )
         INNER JOIN vbak AS c
         ON ( bvbeln EQ cvbeln )
         JOIN lqua AS d
         ON ( bcharg EQ dcharg )
         WHERE b~vbeln IN s_vbeln
           AND c~kunnr IN s_kunnr
           AND d~werks IN s_werks
            AND c~auart EQ 'ZOR'
            AND b~abgru EQ space.
wherin primary key fields of tables are:
a)vlccuorder is  vguid
b)vbap  is vbeln and posnr
c)vbak  is vbeln
thanks in advance.

Answer 1

with such low numbers I don't think the sql needs breaking up. I think it's just innefficient because the joins to LQUA is not specified at a low enough level AND does not specify the material, only the batch(CHARG) so hitting this table will be very inefficient. I also think it should be restructured to work down the hierarchy from top to bottom.
This might be better:
SELECT vlccvguid vbapvbeln vbapposnr vbapcharg
vbapbwtar vbakkunnr vbap~kwmeng
INTO corresponding fields of TABLE i_sales
FROM
vlccuorder AS vlcc
INNER JOIN vbap
ON ( vlccvbeln EQ vbapvbeln
AND vlccposnr EQ vbapposnr )
INNER JOIN vbak
ON ( vbapvbeln EQ vbakvbeln )
JOIN lqua
ON ( vbapcharg EQ lquacharg )
WHERE vbap~vbeln IN s_vbeln
AND vbak~kunnr IN s_kunnr
AND lqua~werks IN s_werks
AND vbak~auart EQ 'ZOR'
AND vbap~abgru EQ space.
FROM vbak
JOIN vbap
ON ( vbapvbeln EQ vbakvbeln )
join vlccuorder as vlcc
ON ( vlccvbeln EQ vbapvbeln
AND vlccposnr EQ vbapposnr )
JOIN lqua
ON ( lquamatnr eq vbapmatnr
and lquawerks eq vbapwerks
and lquacharg EQ vbapcharg )
WHERE vbak~vbeln IN s_vbeln
  AND vbak~kunnr IN s_kunnr
  AND vbak~auart EQ 'ZOR'
  AND vbap~abgru EQ space.
  AND vbap~werks IN s_werks.