Herve,

> What can I do to get better results ?? (configuration option, and/or
> hardware update ?)
> What can I give you to get more important informations to help me ?

1) What PostgreSQL version are you using?

2) What's your VACUUM, ANALYZE, VACUUM FULL, REINDEX schedule?

3) Can you list the non-default settings in your PostgreSQL.conf?  
Particularly, shared_buffers, sort_mem, checkpoint_segments, estimated_cache, 
and max_fsm_pages?

-- 
Josh Berkus
Aglio Database Solutions
San Francisco

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