On Tue, May 21, 2019 at 11:15 AM Peter Geoghegan <pg@bowt.ie> wrote:
On Tue, May 21, 2019 at 11:12 AM Walter Smith <walter@carezone.com> wrote > I did a VACUUM overnight and got the following. The thing that stands out to me is that one index (index_unproc_notifications_on_notifiable_type) took 100x longer to scan than the others. That's not the index used in the slow query, though.
What columns are indexed by index_unproc_notifications_on_notifiable_type, and what are their datatypes?
It occurs to me that is a somewhat unusual index -- it tracks unprocessed notifications so it gets an insert and delete for every row, and is normally almost empty.
Index "public.index_unproc_notifications_on_notifiable_type"
