Hi, Regarding pg_stat_io for the startup process, I noticed that the counters are only incremented after the startup process exits, not during WAL replay in standby mode. This is because pgstat_flush_io() is only called when the startup process exits. Shouldn't it be called during WAL replay as well to report IO statistics by the startup process even in standby mode?
Also, the pg_stat_io view includes a row with backend_type=startup and context=vacuum, but it seems that the startup process doesn't perform any I/O operations with BAS_VACUUM. If this understanding is right, shouldn't we omit this row from the view? Additionally, I noticed that the view also includes a row with backend_type=startup and context=bulkread / bulkwrite. Do these operations actually occur during startup process? Regards, -- Fujii Masao Advanced Computing Technology Center Research and Development Headquarters NTT DATA CORPORATION
