Hi all

We have PostgreSql 9.6 running and started to work with materialized views. To 
refresh the materialized views, we set up a cron job that refreshes the 
materialized views on a fix schedule.
Since our materialized views cache quite some data, we noticed a considerable 
increase in WAL files. It seems, that every refresh of a materialized view is 
logged in the WAL.

We tried to figure out how we can alter the materialized view to set it to 
"UNLOGGED" but this does not seem possible.
--> "alter materialized view xyz set UNLOGGED;" leads to "ERROR:  "xyz" is not 
a table, SQL state: 42809"

Is there another way to avoid logging a refresh of a materialized view in the 
WAL?

Kind regards,
Alain Remund

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