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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1answer
122 views

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'...
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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 ...
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1answer
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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 ...
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50 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 ...
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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
89 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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25 views

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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Table recent performance degradation

So on my current project we have an ETL process that on its final stage ends up writing about 35 million of records on table on a PostgreSQL database (PostGIS actually). The version we are currently ...
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1answer
167 views

Stored Procedure for Vacuum in PostgreSQL

I want to create a stored procedure to trigger vacuum, I know there are many ways to automate vacuum, but I would like to use the stored procedure (Postgresql 9.6). The problem Im facing is, I can't ...
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Avoid table bloat while using read-replica in Postgresql 10.x

I have 100+ tables in the Primary server, in that one table (work queue table) is relatively small and it won't grow more than 20MB (~200K rows) at anytime until unless there is no huge bloat. The ...
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1answer
31 views

Why is VACUUM FULL necessary here?

Queries are running very slowly on a table with 80k rows. SELECT count(*) FROM task takes <100ms. SELECT type, count(*) FROM task GROUP BY type takes 30,000ms. Basically, any query that is not ...
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1answer
44 views

How to have PostgreSQL running forever with constant insert and delete per day

Question: Lots of rows are getting inserted every second. Batch deletion is performed when the disk is close to full. This causes two problems: It is impossible to examine actually how much space in ...
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1answer
78 views

Long running VACUUM VERBSE in Postgres 9.5 - how much time remaining?

I am vacuuming a very large (718GB) table containing a lot of dead tuples and 4 indexes. VACUUM ANALYSE VERBOSE bigtable; This vacuum has been running for over 11 hours (!) now and I am trying to ...
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2answers
46 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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2answers
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Why is VACUUM FULL locking ALL databases on the cluster?

From everything I have read about VACUUM FULL, I would expect it to lock the database I'm running it on, but it renders every database in the cluster inaccessible. Is there perhaps something we might ...
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1answer
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How much disk space was made available to Postgres by VACUUM that is not available to the OS?

VACUUM does not return disk space to the OS, instead it marks dead rows to be reused for future writes. My server has almost ran out of disk space, afterwards I ran DELETE FROM big_table to clear ...
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421 views

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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Postgres 9.4.5 small table grows into huge size - periodic VACUUM FULL needed

We are running a PostgreSQL database on Windows Server. The database version is 9.4.5 (it's been running stable for a long time now so we aren't updating it). Some of our tables have millions of rows,...
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1answer
57 views

Postgres: Reclaiming Space

I have a server with 150GB of diskspace. Today I uploaded a dataset of 30GB. I cancelled the import due to internet dying, then noticed there was 29GB of space missing in the database (meaning the CSV ...
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1answer
132 views

Postgres VACUUM VERBOSE information

I am using Postgres with psycopg2 and sometimes when I run VACUUM VERBOSE table_name; it gives me a line giving the oldest xmin and sometimes it does not. Is there a way to make sure that it always ...
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1answer
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Does a Postgres VACUUM free up space for any database object?

If I do a VACUUM on a Postgres table (without the FULL option) I know that it should make any free-space available to the database, but not the operating system. Should it make the freespace ...
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1answer
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uncommitted xmin during vacuum, what to do?

Running vacuum on two specific tables in my postgresql 10 database results in the following error: VACUUM (FULL|ANALYZE|FREEZE|) table; ERROR: uncommitted xmin 359569171 from before xid cutoff ...
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1answer
266 views

Postgres VACUUM taking forever

I have an specific table that is taking forever o VACUUM. There are no locks in the DB and even letting it overnight the VACUUM didn't finish. According to the statistics (ANALYZE works fine) the ...
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1answer
785 views

Is it necessary to ANALYZE a table after an index has been created?

In my transaction, I am creating a temporary table: create temporary table x on commit drop as select ... I also add an index on that table: create index on x(some_column); Is it now necessary to ...
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1answer
344 views

Postgresql Vacuum and replication

I have an architecture of cascading replication with 3 postgresql db Because the master is becoming too big (~ 170Gig), I wanted to run a "cleaning" job over the week-end that would do ...
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1answer
711 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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2answers
39 views

Speeding up Postgresql manual index reset?

I'm merging databases with each other. One problem I have is that both of the database tables have the same primary keys (starting from 1, but otherwise they are different records). To solve this, I ...
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1answer
250 views

Postgresql upgrade generated vaccumdb script not vacuuming?

When performing an upgrade, postgresql generates a script with the following command in it: "/usr/lib/postgresql/11/bin/vacuumdb" --all --analyze-in-stages On the page: https://www.postgresql.org/...
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733 views

Does SELECT remove dead rows like VACUUM does?

I was fiddling with VACUUM and noticed some unexpected behavior where SELECTing rows from a table seems to reduce the work VACUUM has to do afterwards. Test Data Note: autovacuum is disabled CREATE ...
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1answer
697 views

How do we get around PostgreSQL autovacuum taking a table-level lock ACCESS EXCLUSIVE on replicas?

We are running: user@primary/client-n:~$ psql -d database -c "SELECT version();" version --------------------------------------------...
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Can I do vacuumlo,vacuumdb and reindex in live production system without any downtime in postgres database

We are using a Postgres database (9.3) as our production database. It is generating huge lo objects. Due to this, the size is growing very fast. So we need to do database cleaning frequently. To ...
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1answer
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How can I check available space of an index's pages in PostgreSQL?

For tables, I can simply use pg_freespace to check available spaces like below: postgres=> SELECT count(*),avg(1000*avail/8192)/10 FROM pg_freespace('tablename'); count | ?column? ...
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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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379 views

Postgresql, vacuum issues

I experiencing issues while vacuuming a DB table: database=# vacuum (verbose) table_name; INFO: vacuuming "public.table_name" ERROR: uncommitted xmin 415285800 from before xid cutoff 462314292 ...
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1answer
805 views

Checking space availability before a VACUUM FULL (postgres)

Is it possible to check how much re-usable space is available in a tablespace before running a VACUUM FULL on a large table? I have a large postgres table (about 20G) that gets an occasional VACUUM ...
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580 views

AWS Aurora Database Corruption

I'm running Aurora Postgres and noticed that metric Maximum Used Transaction IDs is increasing a lot. Trying to manually vacuum the tables that's was not automatically vacuumed lead me to the ...
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0answers
552 views

Does VACUUM FULL ANALYZE a partition locks the main table in postgresql?

I'm using postgresql 9.5 and partman for partitioning tables. there is this table that has 30 partitions and volume of one of them are too higher than others. so I need to full vacuum this partition ...
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2answers
1k views

How to optimize a table for a very high-frequency updates?

I have a table that contains a list of tasks that need to be run periodically: applaudience=> \d+ maintenance_task Table "...
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1answer
349 views

Is it safe to move big table to another tablespace while working with it?

I have one big bloated table (real data size approx 65 Gb, 140 Gb on disk). Vacuum does not work cause of low space on default tablespace disk. So I want to clean the database from trash by moving fat ...
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1answer
105 views

Is postgres vacuum secure

Postgres delete doesn't actually remove the record from the table file. Once the delete is committed and the last transaction is closed, no postgres process can see the record any more, the deleted ...
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1answer
577 views

PostgreSQL - VACUUM speed (Heroku)

My DB have a main table that is has lots of commits on a daily basis, with about 15 indexes on this table. The table has 25M rows and the dead row count seem to exceed the number of live rows at the ...
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1answer
40 views

Small databases, large backup files

We have PostgreSQL 9.6 databases and a dailytask running a pg_dump for all databases, though these backups are getting "large" at this point. My database was 900MB, then I tried clearing it by ...
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1answer
111 views

Not find the table of the oid

I have a database running under PostgreSQL which normally has to have a size of 300 GB. Unfortunately it is now 3,5 TB in size. I noticed that the directory of this database , the pgdata path is /...
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1answer
1k views

XID wraparound metrics are unclear

Recently, I had an issue with one of my database which got XID wraparound issue. So, I have started with single-user mode and ran vacuum. Everything was fine. But, when I checked datfrozenxid its ~1....
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1answer
1k views

Autovacuum is not running or working

We're currently using Postgres 9.4.14 hosting Zabbix 2.4 database. For a while now, the following message started to happens: < 2017-11-23 15:15:20.037 -03 >HINT: Close open transactions soon ...
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1answer
67 views

What version of PostgreSQL first implemented autovacuum?

I'm just wondering what version of PostgreSQL first implemented autovacuum.
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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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1answer
2k views

Time taken by VACUUM FULL to reclaim space

After receiving some insightful guidance in a previous post here, I'm going to run VACUUM FULL on 4 PostgreSQL 9.3.10 tables. Table sizes are: 1) links_publicreply: ~30M rows, 9 columns, 3 indexes (...
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1answer
4k views

Postgres Vacuum in Function

After googleing a bit, it's plainly clear you cannot run vacuum from a function: Postgres mailing - Vacuum behaviour in plpgsql function You can't run VACUUM from inside a function because of ...
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1answer
447 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 ...