I am running TPC-H with scale factor of 1 on RedHat7.2 with the kernel
2.5.74. Q17 can always finish in about 7 seconds on my system. The
execution plan is:
----------------------------------------------------------------------------------------------------
Aggregate (cost=780402.43..780402.43 rows=1 width=48)
-> Nested Loop (cost=0.00..780397.50 rows=1973 width=48)
Join Filter: ("inner".l_quantity < (subplan))
-> Seq Scan on part (cost=0.00..8548.00 rows=197 width=12)
Filter: ((p_brand = 'Brand#31'::bpchar) AND (p_container
= 'LG CASE'::bpchar))
-> Index Scan using i_l_partkey on lineitem
(cost=0.00..124.32 rows=30 width=36)
Index Cond: ("outer".p_partkey = lineitem.l_partkey)
SubPlan
-> Aggregate (cost=124.40..124.40 rows=1 width=11)
-> Index Scan using i_l_partkey on lineitem
(cost=0.00..124.32 rows=30 width=11)
Index Cond: (l_partkey = $0)
(11 rows)
Hope this helps,
Jenny
On Thu, 2003-09-25 at 12:40, Oleg Lebedev wrote:
> I am running TPC-R benchmarks with a scale factor of 1, which correspond
> to approximately 1 GB database size on PostgreSQL 7.3.4 installed on
> CygWin on Windows XP. I dedicated 128 MB of shared memory to my postrges
> installation.
> Most of the queries were able to complete in a matter of minutes, but
> query 17 was taking hours and hours. The query is show below. Is there
> any way to optimize it ?
>
> select
> sum(l_extendedprice) / 7.0 as avg_yearly
> from
> lineitem,
> part
> where
> p_partkey = l_partkey
> and p_brand = 'Brand#11'
> and p_container = 'SM PKG'
> and l_quantity < (
> select
> 0.2 * avg(l_quantity)
> from
> lineitem
> where
> l_partkey = p_partkey
> );
>
> Thanks.
>
> Oleg
>
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