Re: Why isn't my table auto-analyzed/vacuumed?

Hi,

Since the autovacuum decides whether to vacuum or analyze a table based on thresholds .As the threshold to trigger autovacuum is high so it might not have been triggered .

vacuum_trigger_threshold =
autovacuum_vacuum_threshold + (autovacuum_vacuum_scale_factor × n_live_tup)
You may check below mentioned parameters:
autovacuum = on
autovacuum_vacuum_threshold = 50 # min number of row updates before                                         vacuum
autovacuum_vacuum_scale_factor = 0.01 # vacuum triggers at 1%
autovacuum_naptime = X # time between autovacuum runs

Thanks & Regards

Dinesh Nair

________________________________
From: Dimitrios Apostolou <jimis(at)gmx(dot)net>
Sent: Thursday, October 30, 2025 9:25 PM
To: pgsql-general(at)lists(dot)postgresql(dot)org <pgsql-general(at)lists(dot)postgresql(dot)org>
Subject: Why isn't my table auto-analyzed/vacuumed?

Caution: This email was sent from an external source. Please verify the sender’s identity before clicking links or opening attachments.

Hello list,

I have a table that is constantly growing, and it's not being
vacuumed/analyzed. I think my problem is rather common, but how to even
debug it if "nothing works"?

I've already set log_autovacuum_min_duration = 0 but the table is never
mentioned in my logs, grep'ing for "vacuum".

I have run ANALYZE manually once but nothing automatic.
Here is more info:

> SELECT * FROM pg_stat_user_tables WHERE relname =
'test_runs_summarized_per_function' \gx
-[ RECORD 1 ]-------+----------------------------------
relid | 780653
schemaname | public
relname | test_runs_summarized_per_function
seq_scan | 32
last_seq_scan | 2025-10-19 10:31:08.289922+00
seq_tup_read | 26484817584
idx_scan | 4554128
last_idx_scan | 2025-10-10 22:02:50.987532+00
idx_tup_fetch | 7418587674
n_tup_ins | 921064234
n_tup_upd | 0
n_tup_del | 0
n_tup_hot_upd | 0
n_tup_newpage_upd | 0
n_live_tup | 6484485348
n_dead_tup | 0
n_mod_since_analyze | 423101205
n_ins_since_vacuum | 921064234
last_vacuum |
last_autovacuum |
last_analyze | 2025-09-30 18:24:47.550543+00
last_autoanalyze |
vacuum_count | 0
autovacuum_count | 0
analyze_count | 1
autoanalyze_count | 0

> SELECT reltuples FROM pg_class WHERE relname =
'test_runs_summarized_per_function' \gx
-[ RECORD 1 ]-----------
reltuples | 6.061923e+09

> SELECT name,setting FROM pg_settings WHERE name ILIKE '%factor%' ;
name | setting
---------------------------------------+---------
autovacuum_analyze_scale_factor | 0.1
autovacuum_vacuum_insert_scale_factor | 0.2
autovacuum_vacuum_scale_factor | 0.2
recursive_worktable_factor | 10

How can I get more info from postgres on the autovacuum logic?

Thank you in advance,
Dimitris