STATISTICS VIEW · Statistics view

pg_stat_wal

PostgreSQL documentation ↗Source definition ↗

The pg_stat_wal view will always have a single row, containing data about WAL activity of the cluster.

First seen PG 14Last seen PG 19Columns 5

9.0 9.1 9.2 9.3 9.4 9.5 9.6 10 11 12 13 14 15 16 17 18 19^β3

Checked column by column against a PostgreSQL 18.6 instance · Raw measurement record ↗

Columns PostgreSQL 18

pg_stat_wal

COLUMN	TYPE	DESCRIPTION
`wal_records`	`bigint`	Total number of WAL records generated
`wal_fpi`	`bigint`	Total number of WAL full page images generated
`wal_bytes`	`numeric`	Total amount of WAL generated in bytes
`wal_buffers_full`	`bigint`	Number of times WAL data was written to disk because WAL buffers became full
`stats_reset`	`timestamp with time zone`	Time at which these statistics were last reset

Columns marked "implicit" are not included in SELECT *; some early statistics views are completed from same-version source, and the extra provenance is shown in the column description.

Column evolution matrix

Hover a cell for the column type

PresentAdded / type or attribute changeRemoved

COLUMN	9.0	9.1	9.2	9.3	9.4	9.5	9.6	10	11	12	13	14	15	16	17	18	19
`wal_records`	–	–	–	–	–	–	–	–	–	–	–
`wal_fpi`	–	–	–	–	–	–	–	–	–	–	–
`wal_bytes`	–	–	–	–	–	–	–	–	–	–	–
`wal_buffers_full`	–	–	–	–	–	–	–	–	–	–	–
`wal_write`	–	–	–	–	–	–	–	–	–	–	–					−	–
`wal_sync`	–	–	–	–	–	–	–	–	–	–	–					−	–
`wal_write_time`	–	–	–	–	–	–	–	–	–	–	–					−	–
`wal_sync_time`	–	–	–	–	–	–	–	–	–	–	–					−	–
`stats_reset`	–	–	–	–	–	–	–	–	–	–	–
`wal_fpi_bytes`	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–

9.0 is the coverage baseline; a column already present in the baseline is not marked as added. The matrix aligns columns by name, so a rename appears as the old column removed and a new column added.

Evolution timeline

Changes between adjacent majors

PostgreSQL 19 ← 18

+ wal_fpi_bytes

PostgreSQL 18 ← 17

− wal_write− wal_sync− wal_write_time− wal_sync_time

PostgreSQL 17 ← 16

2 column description updates

PostgreSQL 14 ← 13Catalog added

+ wal_records+ wal_fpi+ wal_bytes+ wal_buffers_full+ wal_write+ wal_sync+ wal_write_time+ wal_sync_time+ stats_reset

Compare any two versions

FROMTOInclude description updates

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