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/include/executor | |
| 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/include/executor')
| -rw-r--r-- | src/include/executor/instrument.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/include/executor/instrument.h b/src/include/executor/instrument.h index 03653ab6c6c..ffe470f2b84 100644 --- a/src/include/executor/instrument.h +++ b/src/include/executor/instrument.h @@ -53,6 +53,7 @@ typedef struct WalUsage int64 wal_records; /* # of WAL records produced */ int64 wal_fpi; /* # of WAL full page images produced */ uint64 wal_bytes; /* size of WAL records produced */ + uint64 wal_fpi_bytes; /* size of WAL full page images produced */ int64 wal_buffers_full; /* # of times the WAL buffers became full */ } WalUsage; |