Re: materialized view refresh of a foreign table

On Sun, Jun 23, 2019 at 10:21 AM Rick Otten <rottenwindfish(at)gmail(dot)com>
wrote:

> I'm not sure where else to look, so I'm asking here for tips.
>
> I have a table in a remote (Heroku-managed) postgresql database (PG 10.7).
>
> On the other end, (PG 11.3) I have a foreign table configured with a
> materialized view in front of it.
>
> Up until Thursday evening, it was taking about 12 - 15 seconds to refresh,
> it is only 15,000 rows with 41 columns. Since Thursday evening it has
> been taking 15 _minutes_ or more to refresh. Nothing changed on my end
> that I'm aware of. It completes, it just takes forever.
>
>
I believe I've solved this mystery. Thanks for hearing me out. Just the
opportunity to summarize everything I'd tried helped me discover the root
cause.

In the middle of the table there is a 'text' column. Since last Thursday
there were a number of rows that were populated with very long strings.
(lots of text in that column). This appears to have completely bogged
down the materialized view refresh. Since we weren't using that column in
our analytics database at this time, I simply removed it from the
materialized view. If we do end up needing it, I'll give it its own
materialized view and/or look at chopping up the text into just the bits we
need.