Postgres Pro
Downloads
Home   >   mailing lists

Re: Why does the number of rows are different in actual and estimated. - Mailing list pgsql-performance

From Andrew Dunstan
Subject Re: Why does the number of rows are different in actual and estimated.
Date
Msg-id 50CA6036.6000107@dunslane.net
Whole thread Raw
In response to Re: Why does the number of rows are different in actual and estimated.  (Claudio Freire <klaussfreire@gmail.com>)
Responses Re: Why does the number of rows are different in actual and estimated.
List pgsql-performance
Tree view 
On 12/13/2012 05:42 PM, Claudio Freire wrote:
> And it looks like it all may be starting to go south here:
>>                                         ->  Hash Join  (cost=9337.97..18115.71 rows=34489 width=244) (actual
time=418.054..1156.453rows=205420 loops=1) 
>>                                               Hash Cond: (customerdetails.customerid = entity.id)


Well, it looks like it's choosing a join order that's quite a bit
different from the way the query is expressed, so the OP might need to
play around with forcing the join order some.


cheers

andrew

pgsql-performance by date:

Previous
From: Claudio Freire
Date:
Subject: Re: Why does the number of rows are different in actual and estimated.
Next
From: Evgeny Shishkin
Date:
Subject: Re: Why does the number of rows are different in actual and estimated.