Re: TPC-R benchmarks - Mailing list pgsql-performance

From Jenny Zhang
Subject Re: TPC-R benchmarks
Date
Msg-id 1064525555.2082.39.camel@ibm-a.pdx.osdl.net
Whole thread Raw
In response to TPC-R benchmarks  (Oleg Lebedev <oleg.lebedev@waterford.org>)
Responses Re: TPC-R benchmarks  ("Timothy D. Witham" <wookie@osdl.org>)
List pgsql-performance
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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