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how can i improve the performance of this query

   , count(distinct item_loc.ITEM_ID ) TOTAL_ITEM_SHIP_INTL
from b_views.D_LOC item_loc
    ,b_views.D_W item_w
    ,b_views.D_C shpmt_loc
    ,b_views.D_CNTRIES cntry_1
    ,b_views.D_CNTRIES cntry_2
Where item_loc.ITEM_ID=item_w.ITEM_ID
And   item_loc.S_CODE=shpmt_loc.S_CODE
And   shpmt_loc.CNTRY_ID=cntry_1.CNTRY_ID
and   item_w.SLR_CNTRY_ID = cntry_2.CNTRY_ID
and   cntry_1.R_ROLLUP <> cntry_2.R_ROLLUP
And   item_w.L_ID=1
AND   item_w.P_FLAG<>'X'
Group by 1

RE: performance

Firstly, run an EXPLAIN, then check the Primary Indexes of the tables and finally check that you have fresh STATS

Then use the details of the Primary Index and the STATS to improve the step by step details of the EXPLAIN

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