Re: Why does the number of rows are different in actual and estimated.

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On Dec 14, 2012, at 3:09 AM, Andrew Dunstan <andrew@xxxxxxxxxxxx> wrote:

> 
> 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..1156.453 rows=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.
> 
> 

OP joins 8 tables, and i suppose join collapse limit is set to default 8. I thought postgresql's optimiser is not mysql's.

> cheers
> 
> andrew
> 
> 
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