Hello list, what is the "background worker" in the pg_stat_io statistics view? I'm reading the documentation but can't figure this one out knowing that it is not autovacuum or bgwriter. And I'm not aware of any extension I might have with registered background worker. Additionally, how can it be evictions > writes? I would expect every eviction to cause a write. Finally about "hits", I understand they are reads found in shared_buffers, so they never registered into the "reads" counter. So is "reads" in pg_stat_io the equivalent to misses, i.e. the opposite of "hits", the read attempts not found in the shared_buffers, that needed to be fetched from the disk (or OS buffercache)? backend_type | object | context | reads | read_time | writes | write_time | writebacks | writeback_time | extends | extend_time | op_bytes | hits | evictions | reuses | fsyncs | fsync_time | stats_reset -------------------+---------------+---------+---------+-------------+--------+------------+------------+----------------+---------+-------------+----------+-----------+-----------+--------+--------+------------+------------------------------- background worker | relation | normal | 5139575 | 2196288.011 | 63277 | 1766.94 | 0 | 0 | 0 | 0 | 8192 | 876913705 | 5139653 | | 0 | 0 | 2024-04-08 08:50:02.971192+00 Thank you in advance, Dimitris
