Questions tagged [autovacuum]
The autovacuum tag has no usage guidance.
94 questions
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Postgresql last_autovacuum and last_autoanalyze
I have a few tables that ere 1 TB+. The columns last_autovacuum and last_autoanalyze in pg_stat_user_tables have NULLs for these tables. The n_dead_tup to n_live_tup ratio is 0.0001. A few questions, ...
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Does regular truncate & insert hurt performance?
We have a large (5 TB) PostgreSQL 15 RDS that acts as a data warehouse, data comes in through regular pipelines and then ~20 users run analytic queries on it.
Our infrastructure people have access to ...
- 559
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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. ...
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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 ...
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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 ...
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49
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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 ...
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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 ...
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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? ...
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282
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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 ...
- 347
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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 ...
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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 ...
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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 ...
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522
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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
) ...
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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.
...
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373
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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 ...
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355
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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
...
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286
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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 ...
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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 - ...
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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 = ...
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359
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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 ...
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301
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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 ...
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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 ...
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166
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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:
...
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618
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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 ...
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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 ...
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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 ...
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208
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 + ...
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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 ...
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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 (...
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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 ...
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2k
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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 ...
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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, ...
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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, ...
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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 ...
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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 ...
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255
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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177
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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 ...
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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, ...
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543
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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 ...
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406
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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. ...
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