Questions tagged [vacuum]

The vacuum command in postgres releases unused space. Be sure to also include the [postgres] tag, and version tag such as [postgresql-9.6]. Include an operating system tag,

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Will Postgres reclaim space when a temporary table is dropped?

I'm using a large number of TEMP TABLES and want to make sure I'm not leaking storage. I create and use the table in a transaction with CREATE TEMP TABLE mytable ... ON COMMIT DROP. I'm having trouble ...
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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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Postgres - What is a vacuum delay?

I'm running Postgres 14.6, and have a number of sessions with a wait event described as Timeout: VacuumDelay. The SQL being run by the session is.... autovacuum: VACUUM public.mytable_202110 (to ...
ConanTheGerbil's user avatar
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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 = ...
Java Guy's user avatar
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Why is changing the type of column causing extensive autovacuum?

I changed the type of a column from varchar to uuid in a table with a couple of million rows. This caused quite an extensive autovacuum. Can somebody explain why this is required and should I have ...
Alex's user avatar
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Disk space and performance issues while updating a PostgreSQL table with over 120 million rows

I have a single table with an approximate size of 85gb and roughly around 120 million of rows (in a PostgreSQL (12.8) database). I need to update all 120 something million rows with an update query to ...
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VACUUM is significantly slower in Postgresql 13 compared to Postgresql 12

After switching to Postgresql 13 (13.6) from Postgresql 12 (12.10), we noticed that the manual VACUUM operation takes significantly more time, often more than double compared to Postgresql 12. Which ...
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Why do postgres DELETEs take up space?

My postgres DB has 20 GB of storage space available but when running a DELETE the space decreases to ~4 GB before increasing again to ~14 GB. I understand that deletions will not return reclaimed ...
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VACUUM takes very long and can not be cancelled

I just issue this command to a table and its been an 2 hours but not finished: vacuum verbose people_data I can not even cancel the process because I can not see the PID using this query: SELECT pid, ...
padjee's user avatar
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Table Toast data is growth out of control

We are using PostgreSQL version 11 in our production environment. And we are running out of disk space because of Postgres. When I check the table sizes in my DB with this query I saw that the ...
Zekeriya Akgül's user avatar
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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 ...
Ricky Ying's user avatar
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Is there a way to VACUUM an sqlite3 database in parts to avoid OperationalError: database or disk is full/reduce size of sqlite3 databse

I have a rather large sqlite3 database that I've built/populated through python over a few months. I have done many inserts/deletes etc while putting it together and it now uses the majority of my ...
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VACUUM FULL using another disk

Current database takes almost all of SSD free space ~802GB. 800 GB of memory is taken by single table and it was never vacuumed since 2019. Recently i deleted old rows from the table and now i need to ...
Tamer Mukayev's user avatar
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VACUUM FULL alternatives on Windows PGSQL (pg_repack, pg_squeeze, ... )

I have a big table which needs a Vacuum full, but I don't have enough disk space. I was looking online and came across some: pg_repack, pg_squeeze, ... Am I mistaken or are all these extensions Linux ...
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Full vacuum on big table (2.7 TB)

I have big database which contains a table of 2.7TB of data. I deleted some records, and I want to reclaim the disk space. However, i only have about 200 gb free disk space left. How can I do this? ...
Morph's user avatar
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Is it possible to never run vacuum full in PostgreSQL

Since a VACUUM FULL locks tables, it is unacceptable for us in our production environment. Is it possible to only run VACUUM and never VACUUM FULL on a production system? Does VACUUM make space ...
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Issue in retrieving disk space post deleting records of Postgres DB, even after running VACUUM on database [duplicate]

My Postgres db was utilizing ~305 gb of space due to data of last 2-3 years, I went ahead and deleted last 2 year data and ran VACUUM, current used disk space is also ~305 gb even after VACUUM has ...
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How to reduce disk usage on a RDS Postgres instance after a significant increase following a VACUUM(FULL, ANALYZE, VERBOSE)?

We have a Postgres 13 database that has been slowly but steadily increasing its disk usage on Amazon RDS. Right before a VACUUM(FULL, ANALYZE, VERBOSE) command it was ~300 GB, but afterwards it jumped ...
Christiaan Westerbeek's user avatar
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PostgreSQL did not released space "UPDATE set column = null", vacuum did not worked too

I have a huge table that I cannot delete the rows, only update the columns that are storing huge base64 data, that I should update to null to try to release space. So I programmed a script that are ...
Luciano Andress Martini's user avatar
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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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Ringstorage: DELETE based on table usage

I am very new to LARGE DATABASE related stuff and Postgres, We plan to have a Postgres db with a million of rows that can grow up to Terabytes because rows include binary data (images). We plan to ...
Christoph's user avatar
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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 ...
lambda's user avatar
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Production PostgreSQL Space Issue, Huge pg_largeobject, Newbie Thrown Off the Deep End! [closed]

Server: PG 9.4, Linux, poorly/defaultly setup, no care and feeding Databases: 6 user databases, all on pg_default CT database: ~435GB pg_largeobject in that DB table size: 427GB total size: 433GB ...
TheSQLGuru's user avatar
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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 ...
Nicholas's user avatar
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3 answers
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Reclaim space after a failed VACUUM FULL

I made small miscalculation and my VACUUM FULL ended up filling the disks of the instance. I managed to free enough space to restart postgres but I am afraid it won't be enough to run VACUUM FULL to ...
ITChap's user avatar
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Postgres slow query on nullable index

Postgres version: 12.7 Table definition: column_name, data_type, is_nullable "id", "integer", "NO" "data",...
MatthewAws's user avatar
1 vote
2 answers
792 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
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Vacuum on large table sometimes takes very long

In a PostgreSQL 11 database server I have a large table (932 million rows, 2150GB, not partitioned) into which I insert about 2-3 million rows every night with a batch job. The table was created with ...
Robert's user avatar
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vacuum freeze PostgreSQL

Sometimes I find it difficult to understand postgreSQL documentation. Now, VACCUM section (https://www.postgresql.org/docs/10/sql-vacuum.html) says this phrase "Aggressive freezing is always ...
George K's user avatar
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Postgres LISTEN transaction prevents auto-vacuum from clearing dead tuples

At work, we have a database table we use for queued jobs, so it sees a lot of throughput. One issue we've run into is that after a weekend without any code changes, the indexes on this table fill with ...
MaxGabriel's user avatar
3 votes
1 answer
878 views

Are reportedly "bloated" index sizes a problem?

I create a table with 1 million records, then I delete those records. (Common with some sort of processing list.) CREATE TABLE example (id int PRIMARY KEY); INSERT INTO example SELECT generate_series(...
Paul Draper's user avatar
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1 answer
519 views

Index maintenance on pg_catalog tables in AWS RDS

I have had some bad historical usage on my Aurora PostgreSQL instance. Namely, connections that create a lot of temporary objects and some very long running transactions (which limits autovacuum). Now ...
Paul Draper's user avatar
6 votes
1 answer
2k views

Is vacuuming a PostgreSQL materialized view necessary?

I understand it makes sense to analyze a Materialized View (MV), but since MVs are not updateable, does that imply that we need not ever vacuum a MV?
MichaelDBA's user avatar
1 vote
1 answer
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postgresql vacuum analyze on restored snapshot

Frequently we restore a Postgres DB from a RDS snapshot to an entirely new RDS instance. We notice that queries on certain tables perform really slowly but improve by a huge magnitude after running ...
sumit's user avatar
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1 answer
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Do I need to Vacuum DB after massive insert?

I use Postgres 12.7 I did massive insert using CopyManager. Input: 320GB of tab separated data Sample row is: 2021-03-16T07:14:41.121000 588467 1900000 0 0 0 0 S 0 LITTLE_CHAR -- ...
Capacytron's user avatar
1 vote
1 answer
1k views

Disk space requirement for REINDEX in Postgresql

There is a server with postres 13 running out of disk space. It contains a table metrics that occupies 90% of the entire database. I have deleted old records in this table. Due to this table is used ...
Andrei's user avatar
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3 votes
2 answers
3k views

Postgres database insert become slow after 10 days, and then it needs a full vacuum

We have a postgres database which is almost 15GB's in size after vacuum. With a dedicated hardware i,e 32GB of ram with 12 Cores. The data automatically gets inserted around 300k inserts per day, and ...
omer Farooq's user avatar
2 votes
1 answer
447 views

Questions about Free Space Map of PostgreSQL

Let's create a temporary table (I choose temporary table because autovacuum don't run for this kind of tables): CREATE TEMP TABLE test ( id int PRIMARY KEY GENERATED ALWAYS AS IDENTITY, value int )...
Radu Dumbrăveanu's user avatar
11 votes
1 answer
1k views

UPDATE on big table in PostgreSQL randomly takes too long

I'm trying to figure out why an UPDATE statement takes too long (>30 sec). This is random, i.e. in most cases it finishes in under 100msec. However, sometimes (randomly) it takes > 30sec to ...
safts's user avatar
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1 answer
283 views

Keeping postgres connection behind load balancer alive during long-running query (vacuum)

Background: I have a postgres instance behind a load balancer (AWS Classic Load Balancer). I want to access the database from another cluster through the load balancer and run queries. I cannot change ...
Birne94's user avatar
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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 ...
arthur's user avatar
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6 votes
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Postgres strategy for UPDATE SET x = NULL

It is not clear the strategy Postgres takes when columns are set to NULL: UPDATE tbl SET col1 = NULL, col2 = NULL WHERE created < current_date - INTERVAL '1 year'; Documentation https://www....
gavenkoa's user avatar
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AWS Aurora for PostgreSQL strange vacuum cost parameters

Today, I found out that in AWS Aurora for PostgreSQL 11 the default cluster parameter vacuum_cost_page_miss = 0 whereas vacuum_cost_page_hit = 1. I'd love to understand the logic behind pricing a page ...
Jonathan Jacobson's user avatar
1 vote
1 answer
717 views

VACUUM ANALYSE not reducing index bloat, only VACUUM FULL

We are experiencing many slowdowns due to index bloat. On trying to optimize the index, recreating it seems to generate a much smaller index: ...
brauliobo's user avatar
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5 votes
1 answer
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How to predict how much space a VACUUM FULL would reclaim?

Is there a way to determine in advance how much disk space a VACUUM FULL on a particular table would return to the OS? Therefore you can decide whether it's worth the cost in doing so. Bonus if there'...
OrangeDog's user avatar
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2 votes
2 answers
783 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
1 vote
1 answer
674 views

PostgreSQL - 1 billion rows table cannot get vacuumed despite no errors

I have a statistics table that should be processed in a scheduled task to remove rows and count them into a separate, smaller table. Unfortunately the cron task failed for some period of time and the ...
hazelnutek's user avatar
3 votes
1 answer
484 views

In PostgreSQL, if crashes during VACUUM, will it recover from a checkpoint that is before the frozen transaction ID of VACUUM?

When VACUUM starts, it will calculate a frozen transaction ID and freeze all tuples older than it. Will this frozen TXID be younger than the latest checkpoint? If this is the case, then when the ...
DizzyZeratul's user avatar
2 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
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2 votes
1 answer
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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 ...
lolynns's user avatar
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