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Questions tagged [autovacuum]

Postgres Autovacuum Daemon

PostgreSQL has an optional but highly recommended feature called autovacuum, whose purpose is to automate the execution of VACUUM and ANALYZE commands. When enabled, autovacuum checks for tables that have had a large number of inserted, updated or deleted tuples. These checks use the statistics collection facility; therefore, autovacuum cannot be used unless track_counts is set to true. In the default configuration, autovacuuming is enabled and the related configuration parameters are appropriately set.

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How can I tell if PostgreSQL's Autovacuum is running on UNIX?

How can one tell if the autovacuum daemon in Postgres 9.x is running and maintaining the database cluster?
Clint Pachl
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Refreshing materialized view CONCURRENTLY causes table bloat

In PostgreSQL 9.5 I've decided to create a materialized view "effects" and scheduled an hourly concurrent refresh, since I wanted it to be always available: REFRESH MATERIALIZED VIEW CONCURRENTLY effects; In the beginning everything worked well, my…
Alechko
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Postgres pg_toast in autovacuum - which table?

I have an autovacuum process running on pg_toast: select query, from pg_stat_activity where query like '%autov%'; "autovacuum: VACUUM pg_toast.pg_toast_15404513 " How do I find out what table/index/whatever this pg_toast pertains to? Or is the…
Henley
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PostgreSQL: How to enable autovacuum?

How does one enable autovacuum in PostgreSQL? I understand the purpose, I just can't find a simple answer regarding how to enable it.
JTW
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How can I tell if autovacuum is running on Windows Server 2003 for my PGSQL database?

in the pre-8.x days I have run numerous PGSQL databases on Linux, and did the database vacuuming explicitly via maintenance script. When 8.x came along I did not move to autovacuum on those systems on the basis that it was working fine so no need to…
liamf
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postgresql autovacuum not working although process is running

I have PostgreSQL 9.2 running on Ubuntu. The autovacuum process is running on the server. The database has heavy load, 1000's of additions and 100's of deletions daily and yet it seems that autovacuum isn't firing up. There is nothing relating to…
user1448820
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Why does vacuum analyze change query plan while analyze does not?

I wanted to utilize the power of index-only scans in Postgres and experimented with one table: CREATE TABLE dest.contexts ( id integer NOT NULL, phrase_id integer NOT NULL, lang character varying(5) NOT NULL, ranking_value double precision, …
greatvovan
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Danger in killing autovacuum: VACUUM queries (to prevent wraparound)

There is an autovacuum query that is taking a very long time to run, and preventing alter queries to run. What is the danger is killing this autovacuum process before it's done? PID QUERY 16967 | autovacuum: VACUUM public.articles (to prevent…
Henley
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Autovacuum of a large table takes too long

I upgraded my 9.4 postgresql cluster to 9.6. (via pg_upgrade, so my db stats were not moved to a new cluster) I have a large table(about 450M records). This table is much used in my code(many selects and less upserts). When I start my postgres…
Denis Kuznetsov
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why does autovacuum not vacuum my table?

There is one table in my schema that does not get autovacuumed. If I run VACUUM posts; on the table the vacuum process finishes nicely, but the autovacuum daemon never vacuums the table for some reason. Is there a way to find out why? What could be…
Simon
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How to prevent autovacuum for table in Postgres

I have big tables in which I have only inserts and selects, so when autovacuum for this tables is running - system is very slow. I have switch off autovacuum for specific tables: ALTER TABLE ag_event_20141004_20141009 SET (autovacuum_enabled =…
clarent
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Autovacuum is not running on Openshift Online Postgres cartridge

I have Postgres 9.2 on my Openshift Online cartridge. Using Pgadmin3, I have enabled (by ticking the box) the autovuum setting for postgresql.conf. However, the autovacuum does not seem to be running. Here is what I have: ps -ef | grep -i…
green
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Speed up autovacuum in Postgres

I have a question regarding Postgres autovacuum / vacuum settings. I have a table with 4.5 billion rows and there was a period of time with a lot of updates resulting in ~ 1.5 billion dead tuples. At this point autovacuum was taking a long time…
Rio
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What is autovacuum_vacuum_cost_delay in autovacuum in PostgreSQL?

I am trying to tweak the PostgreSQL server with the following config parameters in the configuration file: autovacuum_freeze_max_age = 500000000 autovacuum_max_workers = 6 autovacuum_naptime = '15s' autovacuum_vacuum_cost_delay =…
Ankit Arora
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PostgreSQL autovacuum causing significant performance degradation

Our Postgres DB (hosted on Google Cloud SQL with 1 CPU, 3.7 GB of RAM, see below) consists mostly of one big ~90GB table with about ~60 million rows. The usage pattern consists almost exclusively of appends and a few indexed reads near the end of…
MrMage
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