"Robert Haas" <[EMAIL PROTECTED]> writes: > ANALYZE with default_statistics_target set to 10 takes 13 s. With > 100, 92 s. With 1000, 289 s.
That is interesting. It would also be interesting to total up the time it takes to run EXPLAIN (without ANALYZE) for a large number of queries. I did start looking at running the experiment Tom was asking for with DBT3 data sets but, uh, the most recent dbt-3 data generation source I could find was four years old. Is there an active source repository for this stuff? > Given the amount of clamor for a higher value for > default_statistics_target, I'm a little surprised by these results. > It may be that the queries I'm running are not ones for which more > statistics generate better plans, but I think they really are > representative of what we run. Maybe someone could suggest some types > of query that would be likely to helped by better statistics? I think there are a lot of variables here. One is the distribution of the data. Your data sounds like it's reasonably evenly distributed. -- Gregory Stark EnterpriseDB http://www.enterprisedb.com Ask me about EnterpriseDB's 24x7 Postgres support! -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
