pg_stat_wal — PostgreSQL statistics view

Summary

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

(Description quoted from the official PostgreSQL documentation.)

Columns

The pg_stat_wal statistics view exposes the following columns (names, types and descriptions are taken verbatim from the PostgreSQL documentation):

• 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_fpi_bytes numeric
  Total amount of WAL full page images 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

Version applicability

Present in PostgreSQL 17, 18, 19 (verified against each release’s documentation). This is a long-standing system object that also exists in earlier PostgreSQL releases.

Related & references

• PostgreSQL system catalog & view index
• Built-in function reference

Reference: PostgreSQL documentation — pg_stat_wal.