I currently have max_connections set to 300, however if i think about it we
will never have that many connections (more like 50 - 100 at most).
2008/5/20 Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>:
> On Tue, May 20, 2008 at 8:14 AM, Andy Dale <andy(dot)dale(at)gmail(dot)com> wrote:
> > Hi,
> > I am currently trying to tweak Postgresql 8.1, to improve the overall
> > performance of the database. I have read over the following page/artical
> > http://www.powerpostgresql.com/PerfList/, however at the moment (not for
> > much longer hopefully) my hands aree tied when it comes to altering the
> > kernel parameters, and thus allocating more shared buffers.
> > I have read over the rest of the artical and adjusted some of the other
> > values mentioned. The values I have altered are:
> > work_mem = 33554 # min 64, size in KB
> Depending on how many connections you're handling and how much memory
> you have, this might be a little large, but it's not terrible. Make
> sure you aren't running your machine low on spare memory, as this can
> cause the machine to start swapping and make it run slower.
> > maintenance_work_mem = 33554 # min 1024, size in KB
> > max_fsm_pages = 100000 # min max_fsm_relations*16, 6
> > each
> > vacuum_cost_delay = 50 # 0-1000 milliseconds
> Maybe a little high. most people find that 10 is just fine to keep
> vacuum from slamming your I/O bandwidth.
> > wal_buffers = 64 # min 4, 8KB each
> > commit_delay = 0 # range 0-100000, in
> > microseconds
> > commit_siblings = 50 # range 1-1000
> Setting a short commit delay may allow for more siblings to get
> committed together.
> > effective_cache_size = 33333000 # typically 8KB each
> > autovacuum = on # enable autovacuum
> > autovacuum_naptime = 30 # time between autovacuum runs, in
> > secs
> > autovacuum_vacuum_threshold = 400 # min # of tuple updates before
> > autovacuum_analyze_threshold = 100 # min # of tuple updates before
> > analyze
> > autovacuum_vacuum_scale_factor = 0.4 # fraction of rel size before
> > autovacuum_analyze_scale_factor = 0.2 # fraction of rel size before
> > analyze
> > Is it ok to have these settings with increasing the amount of shared
> > ?
> Sure. What's your max connections set to?
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