William Dunn <dunnwjr@xxxxxxxxx> writes: > Does anyone which is a more accurate estimate of a table's live > rows: pg_class.reltuples ( > http://www.postgresql.org/docs/current/static/catalog-pg-class.html) > OR pg_stat_all_tables.n_live_tup ( > http://www.postgresql.org/docs/current/static/monitoring-stats.html#PG-STAT-ALL-TABLES-VIEW)? They're both inaccurate with different sources of inaccuracy. I dunno that you should assume that one is necessarily better than the other. > - Is pg_class.reltuples an estimation of live tuples only, or is it of > all tuples (both live and dead)? I would guess it's live only but that is a > guess Hm. I'm pretty sure the planner takes it as counting live tuples only, but it looks like VACUUM thinks it includes recently-dead-but-not-yet- removable tuples. We might need to do some adjustment there. regards, tom lane -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
