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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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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40 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
15 views

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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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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18 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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855 views

Amount of time FULL VACUUM/VACUUM

I have a table "lng_grid_test", which, at the beginning, had around 600 000 000 around. The table is defined as : -- Table: public.lng_grid_test -- DROP TABLE public.lng_grid_test; CREATE TABLE ...
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49 views

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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60 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
735 views

What are the advanvates and disadvantages of vacuum in postgresql?

I'm new to PostgreSQL, I know about the concept of vacuum in database. But I want to know the major advantages and disadvantages of vacuuming process. Also I want to know: What happen if I access ...
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1answer
877 views

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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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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35k views

How to view the current settings of Autovacuum in Postgres?

I've found a million examples of how to set Autovacuum's configuration settings, but can't seem to find how to list the current configuration. Postgres 9.1 is the version I'm most interested in.
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41 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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51 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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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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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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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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509 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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34 views

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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1answer
51 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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99 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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31 views

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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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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1answer
130 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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33k views

How much time will a vacuum/autovacuum operation take?

I manage a big (some hundreds of gigs) database containing tables with various roles, some of them holding millions of records. Some tables only receive large number of inserts and deletes, some other ...
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140 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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237 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
467 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
484 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
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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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184 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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701 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
535 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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187 views

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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3answers
3k views

How to reclaim disk space after delete without rebuilding table?

Our PostgreSQL 9.0 Windows production server is running low on space. In our 100GB database, we have a large table containing TOASTed binary data. We have deleted some rows and need to return the ...
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64 views

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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356 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
625 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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2k views

What fillfactor for caching table?

I have heavily updated / accessed table where I store serialized java objects. They are in the table for 2-3 hours (also are being updated during that period) and then removed. Size of table is around ...
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1answer
298 views

How to find the number of tuples that are vacuum-eligible?

I am trying to find the number of vacuum-eligible tuples in one of our postgres tables. This is the output of vacuum verbose on that table INFO: "act_msgs": found 0 removable, 2217083 nonremovable ...
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3k views

How to `vacuumlo` an RDS PostgreSQL database?

As you may have noticed, as a fully managed data base as a service product, AWS Relational Data base Service (RDS) restricts the execution of userland commands. I was staging a production database, ...
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2answers
937 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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0answers
526 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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510 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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30k views

VACUUM returning disk space to operating system

VACUUM usually does not return disk space to operating system, except in some special cases. From the docs: The standard form of VACUUM removes dead row versions in tables and indexes and marks the ...
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36k views

Are regular VACUUM ANALYZE still recommended under 9.1?

I'm using PostgreSQL 9.1 on Ubuntu. Are scheduled VACUUM ANALYZE still recommended, or is autovacuum enough to take care of all needs? If the answer is "it depends", then: I have a largish database (...
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322 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
96 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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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 ...