Questions tagged [autovacuum]

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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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62 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
176 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
26 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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140 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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1answer
34 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
58 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
183 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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1answer
24 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
951 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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12 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
24 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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30 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
992 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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108 views

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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540 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
639 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
64 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
139 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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153 views

Autovacuum in Postgresql 9.5 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
43 views

What version of PostgreSQL first implemented autovacuum?

I'm just wondering what version of PostgreSQL first implemented autovacuum.
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52 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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293 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
498 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
360 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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2k 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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530 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
436 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
531 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
4k 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 ...
6
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1answer
1k 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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8k 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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172 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 ...
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1answer
71 views

When will autovacuum work in PostgreSQL?

I tested the autovacuum in PostgreSQL. So I create a table company and insert 100 records. Then I checked the table size like, ganapathy=> \dt+ company List of relations ...
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269 views

autovacuum daemon considers pg_largeobject table?

I have a table which is having oid column and few oid column's data might be frequently modified from my application. I thought, it would rewrite the data and replace with new data (basically, thought ...
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283 views

On PostgreSQL 9.5, does partitioning a table prevent autovacuum from automatically running ANALYZE?

I'm trying to grasp the following sentence from https://www.postgresql.org/docs/9.5/static/sql-analyze.html The autovacuum daemon, however, will only consider inserts or updates on the parent table ...
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50 views

Could auto_analyze cause inconsistent (and bad) query plans?

I have a simple table which stores metadata about users in an hstore column. This table has ~1.1M rows. Table "public.stitcher_participant" Column | Type ...
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79 views

How to make sure vacuum is happening in postgres sql db

I have created a table with two columns and created index for the first column. Then inserted 2 million data using generate series function for first column (2nd column is having null). And executed ...
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1answer
2k views

Debug query on big table that is sometimes slow

I have a web API that is backed by a Postgres database, and the performance is generally very good. I monitor the performance of both the database and the application as a whole. Most of my queries (...
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1answer
3k views

When is Postgres autovacuum executed

I am using an older version of Postgres (8.4.20). I know that the autovacuum process is executed frequently to free disk space of queries that deleted or updated data in tables. I have a database ...
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1answer
2k views

Postgres auto analyze performance

On postgresql 9.4 I have a table that never has any updates or deletes, only inserts and selects. It therefore never gets auto vacuumed, but it does still get auto analyzed and when it does it can ...
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693 views

autovacuum launcher process, but no autovacuum workers

Debian Squeeze (yeah, I know), postgresql 9.1. Two similar db servers, one master one shard. postgresql.conf identical between the two besides small memory footprint config differences - all vacuum/...