On 15/09/09 10:42, Frederik Ramm wrote: > Now the two tables create more questions than they answer. Why does the > node table under 8.4 seem to have less entries than under 8.3 when both > have been populated with the same planet file?
An analyse without vacuum only generates an estimate for reltuples. See the doco at http://www.postgresql.org/docs/8.4/static/planner-stats.html which says: For efficiency reasons, reltuples and relpages are not updated on-the-fly, and so they usually contain somewhat out-of-date values. They are updated by VACUUM, ANALYZE, and a few DDL commands such as CREATE INDEX. A stand-alone ANALYZE, that is one not part of VACUUM, generates an approximate reltuples value since it does not read every row of the table. The planner will scale the values it finds in pg_class to match the current physical table size, thus obtaining a closer approximation. Tom -- Tom Hughes (t...@compton.nu) http://www.compton.nu/ _______________________________________________ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
