On Sun, Mar 31, 2019 at 10:49 PM David Rowley <david.rowley@xxxxxxxxxxxxxxx> wrote:
Perhaps a bunch of processes waiting on the access exclusive lock on
the materialized view being released?
log_lock_waits might help you if the MV takes more than a second to
refresh, otherwise, you might need to have a look at ungranted locks
in pg_locks and see if the number of locks spikes during the refresh.
I think David's got the right idea here. Like he said, investigate pg_locks, if it is the refresh materialized view, you can avoid the problem by doing 'REFRESH MATERIALIZED VIEW CONCURRENTLY'. You will need at least one unique index on the table.
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David Rowley http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
