Previously :
>
>Table sizes .....
>
>bk_inv : 46,790,877
>bk_title: 2,311,710
>
>Query :
>
>select i.isbn,
> t.vendor,
> i.store,
> i.qty
>from bk_inv i,
> bk_title t
>where i.isbn = t.isbn
>and t.vendor = '01672708' ;
>
It might be worth putting and index on bk_title.vendor, then the scan of this
table will quickly find the appropriate rows( assuming vendor is
selective)... then the join to bk_inv can use the bk_inv.isbn index as
before, but hopefully with a smaller dataset....(so hopefully it might be
able to use a nested loop from bk_title -> bk_inv instead of a huge merge
join)
It also might be worth playing with sort_mem and shared_buffers (if you have
not done so already) - since you have a reasonable amount of memory.
good luck
Mark
