Re: [BUGS] Rapid deteriation of performance (might be caused by tsearch?) in 7.3.2

> > Up until a few days ago I have been running Postgresl 7.2.3 with
Tsearch
> > from the contrib dir, but at various times the performance of the
> > database would suddenly and rapidly deteriate so that queries which
> > previously took 500ms then took 8 or 9 seconds.

> Hmm, what are the before and after explain analyze results?  Also,
what
> are your conf settings for shared buffers, sort memory and the fsm
> parameters?

shared_buffers = 40960
sort_mem = 20480
#max_fsm_relations = 1000
#max_fsm_pages = 10000

As you can see I've not uncommented or touched the fsm parameters, I
have no idea what they do. Optimisation wise I have only played with
shared_buffers, sort_mem and max_connections.


> > The only cure is a backup and restore of the database

> Did you do a regular vacuum or vacuum full?  If only the former, it's
> possible that you need to either vacuum more frequently and/or raise
the
> free space map settings in your configuration file.

I've been running this daily:

    vacuumdb -h localhost -a -z

Should I be using the full switch then?

I'll get back to you on the other questions if you think they are still
needed.


> pgsql-performance is a better list, so I've replied to there.  You'll
> probably need to join in order to reply to list.

Thanks, especially for not shouting at me heh, this is stressful enough
as it is.


Yours Unwhettedly,
Robert John Shepherd.

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