Re: Long Running Commits - Not Checkpoints

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On Thu, 2007-09-13 at 12:19 -0400, Brad Nicholson wrote:
> On Thu, 2007-09-13 at 12:12 -0400, Greg Smith wrote:
> > On Thu, 13 Sep 2007, Brad Nicholson wrote:
> 
> > I'd be curious to see how you've got your background writer configured to 
> > see if it matches situations like this I've seen in the past.  The 
> > parameters controlling the all scan are the ones you'd might consider 
> > turning down, definately the percentage and possibly the maxpages as well.
> 
> 
> bgwriter_delay = 50                     # 10-10000 milliseconds between
> rounds
> bgwriter_lru_percent = 20.0             # 0-100% of LRU buffers
> scanned/round
> bgwriter_lru_maxpages = 300             # 0-1000 buffers max
> written/round
> bgwriter_all_percent = 20               # 0-100% of all buffers
> scanned/round
> bgwriter_all_maxpages = 600             # 0-1000 buffers max
> written/round

I should add, there are 6 back ends running on this disk array
(different servers and different data partitions) with these bgwriter
settings. 

-- 
Brad Nicholson  416-673-4106
Database Administrator, Afilias Canada Corp.


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