Gabriele Turchi wrote:
> Running an ANALYZE really change the plan, now it is fast as before
> (8.0).
>
> On the production system a VACUUM FULL ANALYZE is run every morning
> after a clean-up, when the "registrazioni" table is empty. During the
> day this table fills up (about 500 record any day), and apparently the
> performances are free-falling very quickly. This behaviour has not
> changed between the old and the new installation.
>
> Can you suggest an easy way to collect and keep up-to-date these
> statistics in a very low-impact way?
>
Why not just periodically (once an hour?) run "ANALYZE registrazioni;"
during the day. This will only update the statistics, and should be very
low impact.
HTH,
Joe