Re: WAL Internals question

Tom Lane a écrit :
> Fabrice Franquenk <Fabrice(dot)Franquenk(at)bull(dot)net> writes:
>
>> Now i tried to set the bgwriter_lru_percent to 100% and
>> bgwriter_lru_maxpages to 1000 and
>> i did not spot any difference with the disk activities, cpu occupation
>> or anything else from
>>
>
> Hmm, are you sure your changes took effect? To get the bgwriter's
> attention you need to make the change in postgresql.conf and then
> SIGHUP or restart the postmaster. I'd have thought you could easily
> measure a difference given that much change ...
>
> regards, tom lane
>
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> TIP 6: explain analyze is your friend
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>
I made sure that all changes in postgresql.conf took effect. I restarted
the postmaster and i could not spot
any difference.
The values of bgwriter_all_percent and bgwriter_all_maxpages are all
default (and i set checkpoints segments value to 250). Could there be
some kind of connection between these parameters and the bgwriter_lru_*
parameters?

by the way, was i correct describing the transaction handling mechanism ?

thanks for your help

regards,
Fabrice Franquenk