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Re: Proposed Query Planner TODO items

From: Tatsuo Ishii <t-ishii(at)sra(dot)co(dot)jp>
To: markw(at)osdl(dot)org
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Proposed Query Planner TODO items
Date: 2004-10-25 04:59:46
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Lists: pgsql-hackers

I see nice graphs for each DBT3 query(for example, It seems
they do not come with normal dbt3-1.4 kit. How did you get them?
Maybe you have slightly modified dbt3 kit?
Tatsuo Ishii

> On  6 Feb, To: tgl(at)sss(dot)pgh(dot)pa(dot)us wrote:
> > On  5 Jan, Tom Lane wrote:
> >> Josh Berkus <josh(at)agliodbs(dot)com> writes:
> >> 
> >>> Summary: Currently, queries with complex "or group" criteria get devolved by 
> >>> the planner into canonical and-or filters resulting in very poor execution on
> >>> large data sets.   We should find better ways of dealing with these queries, 
> >>> for example UNIONing.
> >> 
> >>> Description: While helping OSDL with their derivative TPC-R benchmark, we ran
> >>> into a query (#19) which took several hours to complete on PostgreSQL.
> There's a short summary of the tests I ran over the weekend, with links
> to detailed retults.  Comparing runs 43 (7.4) and 52 (7.5devel), it
> looks like query #7 had the only significant improvement.  Oprofile data
> should be there too, if that'll help.  Let us know if there's anything
> else we can try for you.
> Mark
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