On Wed, Dec 04, 2019 at 03:29:55AM -0800, James Salsman wrote:
> Thank you for your thoughtful reply. This might be much easier:
>
> How about adding another example to
> https://www.postgresql.org/docs/11/planner-stats.html ?
Not sure I see the parallel here. This page talks about planner
statistics, and yours about being able to find missing indexes because
of incorrect stats.
> SELECT relname, seq_scan-idx_scan AS too_much_seq,
> case when seq_scan-idx_scan>0 THEN 'Missing Index?' ELSE 'OK' END,
> pg_relation_size(relid::regclass) AS rel_size, seq_scan, idx_scan
> FROM pg_stat_all_tables
> WHERE schemaname='public' AND pg_relation_size(relid::regclass)>80000
> ORDER BY too_much_seq DESC;
Again. this is a bit more complex than that.
--
Michael