Insert-driven autovacuum threshold fraction (PG13+).
At a glance
| Property | Value |
|---|---|
| Parameter | autovacuum_vacuum_insert_scale_factor |
| Category | Autovacuum |
| Default | 0.2 |
| Value type | boolean / enum / numeric |
| Change scope | Reload (no restart) |
What it does
Insert-only tables are vacuumed when inserted rows exceed autovacuum_vacuum_insert_threshold + scale_factor x reltuples, keeping the visibility map and freezing current.
How to apply a change
Takes effect on configuration reload (sighup context). Run SELECT pg_reload_conf(); or send SIGHUP — no restart needed.
Inspect the current value and source with SHOW autovacuum_vacuum_insert_scale_factor; or SELECT name, setting, unit, context, source FROM pg_settings WHERE name = 'autovacuum_vacuum_insert_scale_factor';.
Tuning guidance
Helps append-only tables get frozen and index-only-scannable. Lower per-table on large insert-only tables.