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Questions tagged [vacuum]

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18 views

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
21 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
21 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 ...
2
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1answer
105 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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1answer
22 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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0answers
36 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 ...
0
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1answer
21 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 ...
0
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1answer
613 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 ...
17
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4answers
26k 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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0answers
78 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") ...
0
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1answer
310 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 ...
1
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1answer
37 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 multiple ...
1
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1answer
45 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 ...
0
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1answer
73 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
27 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 ...
1
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1answer
39 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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2answers
504 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 ...
36
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1answer
30k 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.
1
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1answer
160 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 --------------------------------------------...
0
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1answer
97 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 ...
4
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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 ...
1
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1answer
33 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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0answers
256 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 ...
0
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1answer
124 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 ...
10
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2answers
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 ...
1
vote
1answer
277 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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0answers
182 views

Fixing problems with postgreSQL wal archives

i just took over working postgre sql server, and i noticed in the logs, that are in: /var/log/postgresql/postgresql-9.4-main.log spitting out this warnings: cp: cannot stat 'pg_xlog/...
3
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2answers
2k 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, ...
1
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2answers
541 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 "...
3
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0answers
369 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 ...
2
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0answers
329 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 ...
20
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1answer
24k 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 ...
38
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3answers
33k 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 (...
0
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1answer
242 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 ...
2
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1answer
80 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 ...
1
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1answer
593 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 the major advantages and disadvantages of vacuuming process. Also I want to know: What happen if I access the ...
0
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1answer
39 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 ...
15
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4answers
26k views

Should I manually VACUUM my PostgreSQL database if autovacuum is turned on?

I use software which makes a big PostgreSQL database (there is a table with a million rows in it) and the developers says I should VACUUM and ANALYZE periodically. But the PostgreSQL database default ...
7
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3answers
5k views

VACUUM VERBOSE outputs, nonremovable “dead row versions cannot be removed yet”?

I have a Postgres 9.2 DB where a certain table has lots of nonremovable dead rows: # SELECT * FROM public.pgstattuple('mytable'); table_len | tuple_count | tuple_len | tuple_percent | ...
27
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4answers
26k views

I need to run VACUUM FULL with no available disk space

I have one table that is taking up close to 90% of hd space on our server. I have decided to drop a few columns to free up space. But I need to return the space to the OS. The problem, though, is ...
1
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1answer
75 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 /...
1
vote
1answer
905 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....
2
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1answer
758 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 ...
1
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1answer
46 views

What version of PostgreSQL first implemented autovacuum?

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

ANALYZE command in Redshift fails

I created a table in AWS Redshift (4-node dc1 cluster) in the following manner. CREATE TABLE events ( event_id int, event_date int , event_month_year int , event_year int , ...
1
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0answers
55 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?
2
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1answer
1k 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 (...
2
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4answers
3k views

postgresql cannot drop a table when autovacuum holds lock on it

Autovacuuming process holds RowExclusiveLock and ShareUpdateExclusiveLock on the table, which I want to drop. I read that autovacuum should be canceled automatically, when submitting DROP TABLE ...
1
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1answer
2k 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 ...
1
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1answer
372 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 ...