Try to use Index for big table ITEM
To avoid full table scan.
Create index item_index on item(no);
This will speed the process...
- Sinardy <sinardyxing_at_bcsis.com> wrote:
> Hi,
>
> I have 2 big tables, ITEM (is about 1 million rows)
> and RTNITEM (is about
> 20K rows)
>
> When I do:
>
> SELECT ITEM.no,
> NVL(SUM(ITEM.CUSTSOLD), 0),
> NVL(SUM(RTNITEM.CUSTRTN)
>
> FROM ITEM, RTNITEM
>
> WHERE ITEM.no=RTNITEM.no
>
> GROUP BY ITEM.no;
>
>
> Time to execute above query is to long.
>
> I tried
>
> CREATE OR REPLACE VIEW proc_view_itemsold AS
> SELECT no,
> NVL(SUM(custsold, 0)) AS sold
> FROM item
> GROUP BY no;
>
> CREATE OR REPLACE VIEW proc_view_itemrtn AS
> SELECT no,
> NVL(SUM(custrtn, 0)) as return
> FROM rtnitem
> GROUP BY no;
>
> SELECT i.no,
> i.sold
> r.return
> FROM proc_view_itemsold, proc_view_itemrtn
> WHERE i.no = r.no;
>
> DROP VIEW proc_view_itemsold;
> DROP VIEW proc_view_itemrtn;
>
>
> The result is the same, it took more than 25
> minutes.
>
> Do I have to create a temporary tables instead of
> view to prevent these two
> giant tables producing a cardinality product ?
> In this situation is that possible using inner query
> with where clause again
> to prevent those giant tables combined?
>
>
>
> Thank you,
>
>
> Sinardy
>
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> Author: Sinardy
> INET: sinardyxing_at_bcsis.com
>
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Received on Tue Sep 18 2001 - 23:33:21 CDT
