-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Tom Lane wrote:
| Dennis Bjorklund <db@zigo.dhs.org> writes:
|
|>In this plan it estimates to get 481 but it got 22477. So the estimation
|>was very wrong. You can increase the statistics tarhet on the login_time
|>and it will probably be better (after the next analyze).
|
|
| Given the nature of the data (login times), I'd imagine that the problem
| is simply that he hasn't analyzed recently enough. A bump in stats
| target may not be needed, but he's going to have to re-analyze that
| column often if he wants this sort of query to be estimated accurately,
| because the fraction of entries later than a given time T is *always*
| going to be changing.
Well know that I think about it, I felt my shoulders covered by
pg_autovacuum but looking at the log I see that table never analyzed!
Aaargh.
I already applied the patch for the autovacuum but evidently I have to
make it more aggressive, I'm sorry that I can not made him more aggressive
only for this table.
Thank you all.
Regards
Gaetano Mendola
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.4 (MingW32)
Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org
iD8DBQFBAU3g7UpzwH2SGd4RAhbEAKDLbKXLGRqphBbfyBh6cu7QoqFQhACfdDtu
cGS0K1UuTuwTDp4P2JjQ30A=
=aepf
-----END PGP SIGNATURE-----
