Questions tagged [autovacuum]

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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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After upgrading from Postgres 9.2.4 to Postgres 10.5 query is 170x slower

We recently upgraded our Postgres database from 9.2 to 10.5. We noticed a somewhat odd behavior with a query that under the same circumstances became 170x slower. The query does a join between 2 ...
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1answer
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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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1answer
19 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 ...
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1answer
29 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 ...
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1answer
35 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 ...
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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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1answer
2k views

When exactly does pg_stat_all_tables.last_autovacuum get updated?

I'm looking into issues with our autovacuum settings and trying to understand last_autoanalyze and last_autovacuum from the pg_stat_all_tables. I understand autovacuum to work in an incremental way, ...
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1answer
26 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 ...
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1answer
209 views

Autovacuum in Postgresql database

I am trying to set up autovacuum in my postgresql 9.5 database, but table stats shows me no evidence of that. In postgresql.conf, the autovacuum is already enabled: autovacuum = on In settings, ...
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1answer
21 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 ...
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2answers
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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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1answer
32 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 ...
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1answer
947 views

Postgres - autovacuum on several big tables

I have an issue with autovacuum - I have several big tables (over 10 million records) which are updated very frequently (500 updates per second). Everything works OK until bloat happen :) As I can ...
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2answers
36 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. ...
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1answer
73 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]...
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1answer
244 views

What does pg_stat_activity.xact_start mean for autovacuum threads?

If I see something like: db=> SELECT datname,pid,state, (now() - query_start)::interval, query FROM pg_stat_activity where state != 'idle' and query like 'autovacuum%'; datname | pid | state | ...
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0answers
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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 ...
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31 views

posgresql 11 can not start autovacuum

I want to use autovacuum for vacuum and analyze in PostgreSQL 11.5. I am trying to enable it on a dev server but I can't get it started. According to documentation : autovacuum = on ...
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1answer
307 views

Zabbix partitioning autovacuum causes locking

I have a Zabbix database on a postgresql backend that grew to ~1TB of disk space. The Zabbix housekeeper (a process for removing old data from the tables) was running for over 18 hours so I used this ...
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83 views

PostgreSQL managed by AWS RDS - rdsadmin maxusedtransaction ID not shrinking

We are using AWS RDS Postgres. We reached the 200 million limit on one of the DB and triggered VACUUM FREEZE which took down the instance for roughly 40mins however the XID didn't shrink at all. We ...
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136 views

Postgres TX Wraparound - confused

i am running postgres on aws and trying to get my head around the "tx wraparound topic". i executed the following steps to "play" around take snaptshot of production database (here "our_main_db") ...
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1answer
436 views

Will autovacuum block DROP or TRUNCATE?

When the autovacuum process is vacuuming a large table, will queries like DROP and TRUNCATE be blocked until vacuuming completed? In the documentation,it says Also, the standard form of VACUUM can ...
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1answer
665 views

Why disable Postgres Autovacuum?

I've got a task to work with a 9.6 Postgres DB, and for some reason Autovacuum is disabled. The database was extremely slow, and after a manual VACUUM it could breathe again. The point is, why ...
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1answer
57 views

Autovacuum is not running even after configuring it on

I am using aurora-postgresql version 9.6.8. and I have one main instance , one writer and one reader replica. I am looking for below information: How I can check on a particular instance when ...
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1answer
427 views

Postgres - Vacuum doesn't complete on large/busy table

We have a decently active PG database hosted on AWS. We recently started getting notifications like the following: Transaction ID age reached 750 million. Autovacuum parameter values for [...
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1answer
120 views

ALTER TABLE SET LOGGED locked by autovacuum

metrics is an unlogged table that has around 3M rows, I have just executed the ALTER TABLE metrics SET LOGGED to keep this data logged. But it seems to be locked by some autovacuum running process. ...
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1answer
25 views

Postgres 9.6.6 on Ubuntu 16.04, lots of errors

We're running perfsonar on a group of our servers, and while doing some maintenance work found that we get giant logfiles under /var/log/postgresql table bloat on the database of the perfsonar ...
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1answer
68 views

Do postgres autovacuum properties persist for DB replications?

I would like to understand postgres replication options more, and as I am doing my research, I have come across a concept of autovacuuming in efforts to create routine DB maintenance. My question is ...
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1answer
41 views

slow autovacuum on table with binary data

I have a table with about 4M rows, but each row has some binary data that may consume up to 1Mb. The autovacuum process on this table is taking over 1.5 hours to complete, which seems way to long to ...
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1answer
2k views

'text search dictionary “unaccent” does not exist' entries in postgres log, supposedly during automatic analyze

I have many such entries in the postgresql main log, ever since upgrading to Postgres 10: 2018-03-28 08:51:00.281 CEST [97547] ERROR: text search dictionary "unaccent" does not exist 2018-03-28 08:...
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PostgreSQL autovacuum ignoring “inactive” tables resulting in “transaction id wraparound”

I have a PostgreSQL database with a lot of tables (currently 93k) and I'm seeing issues with transaction id age threatening wraparound, because autovacuum is not getting triggered for clean tables ...
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2answers
2k views

How do I grant PostgreSQL superuser access to vacuum tables?

My logs are constantly filling up with these messages for hundreds of tables: WARNING: skipping "some_table_name" --- only table or database owner can analyze it How do I perform any the following ...
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0answers
788 views

Autovacuum gets exclusive lock and replayed in the slave and lead to system fault

I had trouble in my environment which is related to autovacuum and now I think I understand how this occurs. However, this is kind of a rare issue and so I want to get some advice regarding this issue....
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1answer
845 views

PostgreSQL ERROR: cannot freeze committed xmax

First of all, I am new to PostgreSQL database. In my PostgreSQL log I can see errors bellow and I don't know what is wrong or what I should change. 2018-03-29 10:54:38 CEST::@:[5059]: CONTEXT: ...
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1answer
85 views

Does autovaccum wake up in slave?

I cannot find the answer to question what I wrote in the title. Postgres automatically wake vacuum by autovacuum, but when it's slave does slave wake up autovacuum process?
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1answer
187 views

Postgres - autovacuum in small tables

What would be a suitable setting for autovacuum to act on this table? We have a "sequencia" table, it does what the sequence of postgres should do, but perhaps by using other DBs the development ...
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62 views

What version of PostgreSQL first implemented autovacuum?

I'm just wondering what version of PostgreSQL first implemented autovacuum.
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67 views

Postgresql - Auto vacuum is disables in conf file, but still everyday its running

Im using Postgresql 9.2. I have disabled auto vacuum in Conf, but still, I can see this auto vacuum is running on few tables every day. Can anyone help me find out why its running?
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436 views

autovacuum analyze paralyzing tables

On some tables, an autovacuum: VACUUM ANALYZE public.some_table process will run for 30 min to as long as 10 hours. During this time, updates to the table in question are often locked for 10+ minutes. ...
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1answer
706 views

Tiny table causes extreme performance degradation, fixed by forced VACUUM. Why?

I use PostgreSQL 9.6. I have a query that joins 17 tables, 9 of those having several million rows. The query was running fine but its performance degraded rapidly this week. EXPLAIN's output didn't ...
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1answer
430 views

autovacuum challenges after upgrade to postgresql 9.6

We have a cluster with several dozen databases. It was running great on 9.3 for a year (growing over time) when we did the upgrade to 9.6 last month. Since that time, the database will freeze on ...
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1answer
3k views

Postgresql: Does autovacuum impact query performance? Does it apply locks which impact the performance of other queries? [duplicate]

Postgres recommends using the autovacuum to remove the dead tuples. But does running the autovacuum end up making other queries to the same table slow? Does it add locks (row or table level) which ...
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0answers
663 views

Postgresql 9.6 autovacuum blocks all update operations

I have a table with following definition: CREATE TABLE public.json_stream_packet_filter ( stream_packet_id bigint NOT NULL, filter_data jsonb, CONSTRAINT json_stream_packet_filter_pkey PRIMARY ...
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1answer
544 views

Do the different “types” of autovacuum have different performance characteristics?

In monitoring the autovacuum activity on my database, I've noticed that autovacuums tagged with (to prevent wraparound) seem to take longer than "regular" autovacuums. That got me started trying to ...
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1answer
640 views

Are autovacuum VACUUMs slower than a manual VACUUM?

I have a few large tables that take days to autovacuum, sometimes resulting in poor performance until the vacuum finishes. Most of the recommendations I've seen mention doing a manual VACUUM during ...
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1answer
5k views

Should I disable autovacuum on a table while I do a bulk update?

I need to perform a simple update on all rows in a table. The table has 40-50 million rows. Dropping indexes and constraints during the UPDATE results in a massive performance improvement. But what ...
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1answer
2k views

Postgres long autovacuum halting database

I have a fairly large table (1 million rows) and my database is stuck on an autovacuum (>30 mins) on the this table, causing the whole database to chock. Application won't even load now. -00:37:31....
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1answer
13k views

Does cancelling an (AUTO)VACUUM process in PostgreSQL make all the work done useless?

In some occasions, and after making a massive update, insert or delete from a table, I have started a VACUUM FULL ANALYZE to make sure the DB was not getting too bloated. Doing it in a production ...
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1answer
237 views

Postgres: Missing data after Binary Copy - Is VACUUM FULL required?

I'm running Postgres 9.0 on a relatively big (10TB) and old Database. I must move that database to new server hardware, so I copied the whole $PGDATA directory via rsync of a LVM Snapshot and used ...