On Tue, May 21, 2019 at 11:15 AM Peter Geoghegan <p...@bowt.ie> wrote:
> On Tue, May 21, 2019 at 11:12 AM Walter Smith <wal...@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"
Column | Type | Definition
-----------------+------------------------+-----------------
notifiable_type | character varying(255) | notifiable_type
btree, for table "public.notifications", predicate (processed = false)
Thanks,
Walter
