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PostgreSQL: Long running auto vacuum and high wal rate

Recently a vacuum process triggered by auto vacuum daemon(PostgreSQL13) on one of our table took long 1.5hr to complete. During this period there was high WAL rate up to 7MB/sec and high Disk I/O. ...
goodfella's user avatar
  • 168
0 votes
1 answer
13 views

How to Retrieve and Compare All Settings and Overrides for a Specific Table in PostgreSQL (version 12)?

I am working with a PostgreSQL 12 database and currently investigating a table (table_name in schema schema_name) that has accumulated a significant number of dead tuples. To address this, I am ...
Boon's user avatar
  • 136
0 votes
1 answer
65 views

Optimizing XID management in PostgreSQL: How to avoid INSERT locks in tables?

I would like to raise a question regarding the optimal practices for managing transaction age (XID) in a PostgreSQL database. I am currently using the method of performing VACUUM FULL operations on ...
Patryk's user avatar
  • 1
0 votes
0 answers
29 views

Temporary shutdown of autovacuum during rush hour

I have been asked to temporarily disable autovacuum in PostgreSQL 14.3. From 7 a.m. to 5 p.m., autovacuum is to be turned off, and at other times it is to be turned back on. I intend to achieve this ...
Patryk's user avatar
  • 1
0 votes
1 answer
48 views

Postgres: how to insert and delete many records and to not run out of space

I have a PostgreSQL installation deployed in Kubernetes (with the CloudNative operator) and allocated a 25GB volume for it. My architecture involves several microservices interacting with various ...
Tertium's user avatar
  • 141
-1 votes
1 answer
22 views

Auto vacuum for table ASAP

In my app for Postgresql I have a table and my app inserts rows to that table. It could be 2-3 rows, also it could be 100-200k rows. How to do that auto vacuum runs for that table as soon as possible? ...
sluge's user avatar
  • 101
0 votes
2 answers
165 views

Sensible value for autovacuum_cost_delay

I'm running a data warehouse on an AWS RDS PostgreSQL instance. Most of the heavy lifting is done during the night-batch, and very often we use a TRUNCATE-rebuild strategy, also for large tables (100M ...
Bart Jonk's user avatar
  • 317
0 votes
1 answer
53 views

What's the difference between autovacuum general setting and autovacuum_enabled table setting in PostgreSQL?

We have a database that is now on v15 PostgreSQL, but was recently migrated from v11, and before that v9. I believe that many of the settings for our database were preserved from prior versions and ...
Brian D's user avatar
  • 111
5 votes
1 answer
2k views

High CPU load after massive delete on PostgreSQL server

I've deleted ~65 million rows from a PostgreSQL table with ~75 million rows. As soon as the deletion query completed, the CPU plummeted to 100% for about five minutes. The table from which rows were ...
Alechko's user avatar
  • 229
0 votes
2 answers
43 views

Suprising gained disk space after backup & restore PostgreSQL databases

We backed up, deleted and restored several databases. Surprisingly, the databases occupy 20% less storage space afterwards. Have we lost data or what could have happened here? Autovacuum runs ...
Titus's user avatar
  • 1
0 votes
2 answers
394 views

PostgreSQL query using BRIN index is slow until REINDEX/VACUUM

PostgreSQL 15.2. I have a partitioned table like this: create table event ( dataset_id integer not null, event_id integer not null, second_offset integer not null, -- other columns ) ...
EM0's user avatar
  • 190
1 vote
0 answers
126 views

PostgreSQL 14 blocked

I have a fairly serious problem with PostgreSQL, it happens at intervals of a few days that some tables on my PostgreSQL instance crash, or rather this is my feeling. Linked queries are very slow. ...
Leone Miceli's user avatar
2 votes
0 answers
335 views

Does autovacuum to prevent wraparound on a TOAST table lock its associated user table?

My understanding of the difference between autovacuum versus autovacuum to prevent wraparound is that the former can be interrupted by incoming transactions, whereas the latter will temporarily block ...
Leon's user avatar
  • 21
0 votes
2 answers
285 views

PostgreSQL 12 streaming replication standbys timing out due to autovacuum tasks

We have PostgreSQL 12.9 running on Ubuntu 20.04.3 LTS in a streaming replication setup with 1 primary and 3 standbys where the following options have been configured on all servers: hot_standby=on ...
Diane's user avatar
  • 151
2 votes
1 answer
213 views

Vacuum limited to 1 worker

I'm currently working with a relatively big postgres 9.6 server with multiple databases and observing the following behavior: The server has 5 max parallel workers configured but currently, only one ...
m1602's user avatar
  • 23
0 votes
1 answer
2k views

pg_stat_user_tables has n_live_tup = 0 and last_autonalyze = null for most tables - why are tables not getting analyzed?

Similar to What are the possible meanings of NULL and zero for autovacuum_count, last_autovacuum, and autoanalyze_count in PostgreSQL? except in my case it's PostgreSQL 15.1 and there are no deletes - ...
EM0's user avatar
  • 190
0 votes
1 answer
600 views

postgres manual vacuum and auto vacuum running on the same table

I kicked off a manual vacuum on a 19TB table we have been having problems with 18 days ago. Since then I have discovered that the auto vacuum for this also has triggered and is on wait_event = ...
Java Guy's user avatar
  • 103
0 votes
0 answers
307 views

autovacuum for postgresdb takes a lot of resource on production

On our production database autovacuum runs whenever it's needed. The problem is sometime it runs during the day which is the peak time. Looked at lots of difficult articles on web, we should always ...
Ricky Ying's user avatar
1 vote
1 answer
277 views

Autovacuum does not clear the database

Autovacuum does not clear the database. Databases middle-db Postgres 10.18, AWS RDS(vCPU 2, RAM 8Gb, SSD(gp2) 1100Gib) Table "spree_datafeed_products" relid | 16556 schemaname ...
Ahmad Zahratulaev's user avatar
6 votes
1 answer
2k views

Does UPDATE write a new row version for unchanged, TOASTed values?

I am working with a PostgreSQL table with a large TEXT field, which is theoretically updated on a regular basis. I have thought about storing the data directly in the filesystem, but with TOAST, the ...
Jason's user avatar
  • 183
1 vote
0 answers
160 views

Is it possible to find more details on svv_vacuum_progress status Failed jobs in RedShift?

Running SELECT * FROM svv_vacuum_progress returns... table_name status time_remaining_estimate foo_table Failed The table appears to be most recent in stl_vacuum, but they're marked as completed: ...
Kit Sunde's user avatar
  • 343
0 votes
1 answer
513 views

What happens during auto vacuum / vacuum in PostgreSQL?

The official documentaion here seemed quite cryptic to me. https://www.postgresql.org/docs/13/routine-vacuuming.html#AUTOVACUUM Can someone offer an explanation of what happens under the hood during ...
lambda's user avatar
  • 111
0 votes
1 answer
1k views

Postgres autovacuum keeps transaction id's around to 10% limit, causing aggressive vacuuming to trigger now and then which locks tables

We run multiple Postgres clusters in our infrastructure with 10-30 DB per cluster, ranging from 10 GB size to 1TB in size. I have recently noticed that on all our clusters the wraparound id is always ...
Overklog's user avatar
2 votes
1 answer
2k views

Autovacuum on tables with high-volume updates

I have a database with two tables where every 5 minutes the entire content of those tables is updated (mainly just a single column). The biggest of the two tables has about 170K rows. The autovacuum ...
Nicholas's user avatar
  • 123
0 votes
2 answers
170 views

Does postgres autovaccum's analyze rebuild whole table?

I could not find an answer for this in postgres docs, even though some DBAs in their blogs claim that manual analyze builds whole table stats and autovacuum updates only incremental stats, but ...
Sajith P Shetty's user avatar
0 votes
1 answer
50 views

PostgreSQL with PostGIS - autovacuum for raster table

I have PostGIS enabled and use raster data in the table. This table has over 2 million rows and is being updated, inserted or deleted several times a day (aprox. every 2 hours is entire table ...
Martin Perry's user avatar
1 vote
2 answers
1k views

Preventing Transaction ID Wraparound with vacuum freeze

I recently got few DBs to maintain. I just come up about this "Preventing Transaction ID Wraparound Failures". I checked my DBs and got the numbers: I did vacuumdb -a -v on this DB, and ...
Gumuliokas's user avatar
2 votes
1 answer
2k views

Disable autovacuum for one (pretty much read-only) database in a cluster

I’ve got a PostgreSQL cluster on my development system in which I’ve created several databases. I also have a dump of the last state of the DB of an old system imported in which I (very) occasionally ...
mirabilos's user avatar
  • 170
3 votes
1 answer
859 views

What are the possible meanings of NULL and zero for autovacuum_count, last_autovacuum, and autoanalyze_count in PostgreSQL?

I have a big table (let's call it big_table) in a PostgreSQL 12.7 database running on a Debian GNU/Linux server. The machine has 8 GB of RAM and 4 CPU cores, and mostly dedicated to this PostgreSQL ...
Emre Sevinç's user avatar
1 vote
1 answer
1k views

Tracking (un)successful autovacuums in postgres

I am trying to help a team of junior, senior, principal and chief (mostly JEE) developers to be more data-centric and data-aware. In some cases we look into the data-processing costs, complexity of ...
arthur's user avatar
  • 888
2 votes
1 answer
132 views

When autovaccum will analyze?

Let's suppose that a table foo became eligible for autovacuum analyze, e.g. I have inserted a number of rows into foo that exceeds autovacuum_analyze_scale_factor * number of rows + ...
Radu Dumbrăveanu's user avatar
5 votes
2 answers
2k views

Auto vacuuming high-write, high-update, and mostly read table types

What are good auto vacuum settings (recommendations) for tables like: High Write Table Insert load Range between 30-10,000 inserts in a day. The table can idle for weeks without load, but can get ...
DDD's user avatar
  • 51
1 vote
2 answers
1k views

In Postgres, what should be the autovacuum strategy for big tables (hundreds of millions rows) that get added/removed thousands of rows every day?

I have quite a big table with a lot of daily traffic for reads, inserts and deletions. Currently, it has 392 million of live tuples and 27 million of dead ones. Vacuum settings (...
Julen's user avatar
  • 111
2 votes
2 answers
908 views

nulls on pg_stat_get_progress_info('VACUUM') columns on pg_exporter role

I'm trying to export the results of a query select * from pg_stat_progress_vacuum;. The problem is that the only column values I can see from the created user are: pid datid datname Other columns ...
Jakub Krzeminski's user avatar
0 votes
1 answer
1k views

Blocking automatic vaccum

I have a table message. I saw that queries for this table where long running and caused a memory leak (scheduled job in java app). In pg_stat_activity I saw: wait_event_type wait_event state IO ...
tomas930's user avatar
1 vote
2 answers
4k views

High autovacuum CPU/IO usage from database with more than 10k append-only tables

In my system I have more than 10k tables that are very similar, I only do insert operations in these tables and delete old data via a cron schedule one time per day. These insertions come each minute, ...
Sassa's user avatar
  • 135
2 votes
1 answer
2k views

PostgreSQL last_vacuum is null for some tables

I have a problem where it appears that some large tables in my database are not getting vacuumed by the autovacuum deamon. Here is what I'm seeing: SELECT schemaname, relname, n_live_tup, n_dead_tup, ...
David S's user avatar
  • 284
0 votes
1 answer
563 views

Postgres Performance degradation

I have a Postgres 9.6 database and after some time (15 h), database performance starts to decrease dramatically, to the point where we get client side timeouts due to a very slow response from the ...
Miguel Lopes's user avatar
3 votes
1 answer
1k views

Does dumping/restoring do the same as "vacuum full"?

I have a large database running with PostgreSQL v11, and the disk space is very limited, so I have to VACUUM (FULL) the database frequently (e.g. every day). But vacuuming is a very time-consuming ...
Leon's user avatar
  • 357
2 votes
1 answer
234 views

Postgres Number of Updates/Deletes Since Last Autovacuum

Is there a good way to monitor the number of updates/deletes to a table since the last autovacuum? I'm trying to find tables that aren't updated frequently enough to avoid autovacuum (to prevent ...
Mr. Snrub's user avatar
2 votes
1 answer
2k views

Postgres Autovacuum Progress Monitoring

I have an autovacuum (to prevent wraparound) happening on one of my tables for almost 4 days. I'm wondering if there is any way for me to tell if it's not keeping up with the amount of updates/deletes ...
Mr. Snrub's user avatar
2 votes
1 answer
2k views

Why is autovacuum running during a VACUUM FREEZE on the whole database?

I have a 14.7 TB Postgres(9.1) database that has to endure heavy writes for prolonged periods of time. I know that I need to closely manage my transaction ids to prevent db lockup. Recently I noticed ...
lolynns's user avatar
  • 123
0 votes
0 answers
309 views

Why isn't autovaccum running/completing?

My PostgreSQL instance (AWS Aurora) isn't autovacuuming. Or it is, but it is somehow being interrupted or stopped. I'm not canceling any autovacuum queries (though I suppose AWS itself could be). The ...
Paul Draper's user avatar
3 votes
1 answer
1k views

How can I find the cause of pg_catalog.pg_attribute constantly being vacuumed?

autovacuum seems to constantly run against pg_catalog.pg_attribute for the past week+. This seems pretty odd since we aren't doing constant table changes. How can I understand why it's doing this and ...
Kit Sunde's user avatar
  • 343
0 votes
1 answer
169 views

setup table level Autovacuuming on postgres database

I am trying to setup table level Autovacuuming on postgres database. What all metrices I need to collect and analyze specific to that particular table? I have to enable autovacuuming on all the ...
Chetan Dev Khanna's user avatar
3 votes
2 answers
2k views

PostgreSQL 9.6.12 autovacuum constantly running on system tables

I come from a SQL Server, Oracle, Sybase DBA background but I am now looking into an AWS Aurora cluster running PostgreSQL 9.6.12 and have noticed something which I think is odd, but maybe it's not, ...
dodgybugga's user avatar
0 votes
1 answer
456 views

PostgreSQL vacuum starting too late (every 100k instead of 10k dead rows)

I have a large table (50M) and autovacuum seems to work properly in general. However I started monitoring it with Datadog and I have noticed something strange: select relname, reloptions from ...
collimarco's user avatar
1 vote
2 answers
386 views

How to maintain visibility of all new transactions in append-only PostgreSQL DB without scanning the whole table

Situation PostgreSQL v11 I have a database with a dozen tables. No rows are ever DELETEd or UPDATEd. A bulk of data is INSERTed to all the tables in a 'few' (up to 1,000) transactions every day. ...
afonja's user avatar
  • 13
0 votes
1 answer
2k views

Automatic vacuum fails with `ERROR: XX000: cache lookup failed for type 0`

I've been noticing something like this popping up every 15 seconds in my server logs: 2020-01-30 21:10:30 UTC::@:[24969]:ERROR: XX000: cache lookup failed for type 0 2020-01-30 21:10:30 UTC::@:[24969]...
maciej's user avatar
  • 113
3 votes
0 answers
3k views

How do I fix multixact wraparound after it has already occurred?

I have a database which has a single table for which MultiXact wraparound has already occurred. Neither manual vacuums nor automatic vacuums are able to fix this condition. Manual vacuums fail almost ...
Freiheit's user avatar
  • 259