Re: full outer join performance - Mailing list pgsql-general

From Ben
Subject Re: full outer join performance
Date
Msg-id 43271A4F.1040603@silentmedia.com
Whole thread Raw
In response to Re: full outer join performance  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: full outer join performance
Re: full outer join performance
List pgsql-general
Hrm, as I understand that page, there's not much that can be done about
the join order for outer joins. At least, not when there's on 3 tables
and 1 outer join involved. Am I missing something?

Tom Lane wrote:

>Ben <bench@silentmedia.com> writes:
>
>
>>Are full outer joins expected to perform much worse than inner joins?
>>
>>
>
>You're getting burnt by the outer join forcing a bad join order.
>There's some related discussion here:
>http://www.postgresql.org/docs/8.0/static/explicit-joins.html
>
>            regards, tom lane
>
>


pgsql-general by date:

Previous
From: Tom Lane
Date:
Subject: Re: full outer join performance
Next
From: "Warren Bell"
Date:
Subject: Speed problems