diff options
| author | Michael Paquier <michael@paquier.xyz> | 2025-10-28 16:21:51 +0900 |
|---|---|---|
| committer | Michael Paquier <michael@paquier.xyz> | 2025-10-28 16:21:51 +0900 |
| commit | f9a09aa2952039a9956b44d929b9df74d62a4cd4 (patch) | |
| tree | c68534ad90e49cc537e99fa5193c74454ec9f3b1 /src/backend/executor/instrument.c | |
| parent | 3e8e05596a020f043f1efd6406e4511ea85170bd (diff) | |
Add wal_fpi_bytes to pg_stat_wal and pg_stat_get_backend_wal()
This new counter, called "wal_fpi_bytes", tracks the total amount in
bytes of full page images (FPIs) generated in WAL. This data becomes
available globally via pg_stat_wal, and for backend statistics via
pg_stat_get_backend_wal().
Previously, this information could only be retrieved with pg_waldump or
pg_walinspect, which may not be available depending on the environment,
and are expensive to execute. It offers hints about how much FPIs
impact the WAL generated, which could be a large percentage for some
workloads, as well as the effects of wal_compression or page holes.
Bump catalog version.
Bump PGSTAT_FILE_FORMAT_ID, due to the addition of wal_fpi_bytes in
PgStat_WalCounters.
Author: Shinya Kato <shinya11.kato@gmail.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/CAOzEurQtZEAfg6P0kU3Wa-f9BWQOi0RzJEMPN56wNTOmJLmfaQ@mail.gmail.com
Diffstat (limited to 'src/backend/executor/instrument.c')
| -rw-r--r-- | src/backend/executor/instrument.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/backend/executor/instrument.c b/src/backend/executor/instrument.c index 56e635f4700..9e11c662a7c 100644 --- a/src/backend/executor/instrument.c +++ b/src/backend/executor/instrument.c @@ -280,6 +280,7 @@ WalUsageAdd(WalUsage *dst, WalUsage *add) dst->wal_bytes += add->wal_bytes; dst->wal_records += add->wal_records; dst->wal_fpi += add->wal_fpi; + dst->wal_fpi_bytes += add->wal_fpi_bytes; dst->wal_buffers_full += add->wal_buffers_full; } @@ -289,5 +290,6 @@ WalUsageAccumDiff(WalUsage *dst, const WalUsage *add, const WalUsage *sub) dst->wal_bytes += add->wal_bytes - sub->wal_bytes; dst->wal_records += add->wal_records - sub->wal_records; dst->wal_fpi += add->wal_fpi - sub->wal_fpi; + dst->wal_fpi_bytes += add->wal_fpi_bytes - sub->wal_fpi_bytes; dst->wal_buffers_full += add->wal_buffers_full - sub->wal_buffers_full; } |