Re: Materialized views & dead tuples

Ah, thank you, most of these are CONCURRENTLY so this makes sense.
Appreciate it.

On Wed, Jun 19, 2024 at 12:27 AM Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>
wrote:

> On Tue, 2024-06-18 at 15:28 -0700, Wells Oliver wrote:
> > Apologies for the daft question, but I am surprised to see materialized
> views
> > show up in pg_stat_user_tables with lots of dead tuples. These are
> rematerialized
> > nightly and, I thought, this had the effect of replacing/recreating them
> anew.
> > Can someone shed some light on this?
>
> It makes a difference if you use REFRESH MATERIALIZED VIEW or
> REFRESH MATERIALIZED VIEW CONCURRENTLY.
>
> The first statement will just discard the materialized table and create it
> anew,
> and you will never see a dead tuple.
> The second statement executes the query and updates the materialized
> table, which
> can lead to dead tuples just like a normal UPDATE or DELETE.
>
> Yours,
> Laurenz Albe
>

--
Wells Oliver
wells(dot)oliver(at)gmail(dot)com <wellsoliver(at)gmail(dot)com>