Re: Weird 8.2.4 performance

Mark Kirkwood wrote:
> Kurt Overberg wrote:
>> work_mem = 100MB                        # when I ran the original
>> query, this was set to 1MB, increased on Mark Kirkwood's advice,
>> seemed to help a bit but not really
>>
>
> For future reference, be careful with this parameter, as *every*
> connection will use this much memory for each sort or hash (i.e it's not
> shared and can be allocated several times by each connection!)...yeah, I
> know I suggested increasing it to see what effect it would have :-).

This is however a parameter that can be set on the fly for the specific
query.

Joshua D. Drake


>
> And I'd agree with Steiner and others, looks like caching effects are
> the cause of the timing difference between production and the mac!
>
> Cheers
>
> Mark
>
>
>
>
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