Database Administrators Stack Exchange
Database Administrators Stack Exchange

Questions tagged [autovacuum]

95 questions
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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 database has let me discover that this was not a good…
joanolo
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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 (and API calls for that matter) complete in less…
Jason Whitehorn
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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 about autovacuum? Can autovacuum start a VACUUM or…
jpmc26
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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. -00:37:31.137859 autovacuum: VACUUM public.users SELECT…
Andrew Cetinic
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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 data is already being stored off-page and…
Jason
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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 run in parallel with production database…
Bill Greens
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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, compacting and cleaning up dead tuples in…
jberryman
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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 help (all scans are index scans except for the very…
Julien
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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 which does not have frequent deletes or updates. Does…
user3455531
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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 bursts of inserts at least three times a week. High…
DDD
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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 that haven't been written to in a long time. For…
Gordon Seidoh Worley
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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 deleted has multiple indexes and was in heavy use…
Alechko
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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, which is why I am here to ask the question. I have…
dodgybugga
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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 take over 100 seconds. For that 100 seconds and…
Kyle
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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 server. Currently this big_table has about 103…
Emre Sevinç
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