Questions tagged [vacuum]

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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
44 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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0answers
26 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 ...
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1answer
17 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
35 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
35 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 ...
0
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1answer
67 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 ...
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1answer
27 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
489 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
127 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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1answer
83 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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1answer
31 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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68 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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0answers
239 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
106 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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0answers
161 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/...
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0answers
350 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
304 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
508 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
230 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
79 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
295 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
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 ...
1
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1answer
72 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
858 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
720 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
44 views

What version of PostgreSQL first implemented autovacuum?

I'm just wondering what version of PostgreSQL first implemented autovacuum.
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0answers
53 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 (...
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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
366 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 ...
2
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1answer
386 views

delete hung soon after vacuum verbose analyse

I have a fairly large java webapp system that connects to a postgres8.4 db on rhel. This app only does inserts and reads. This has been running without issue for 2.5 years and for the last year or so ...
2
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1answer
149 views

Does AWS ever `vacuumlo` PostgreSQL RDS instances?

Link to the long story happened before (and reason to have) this question. Does AWS ever vacuumlo PostgreSQL RDS instances?
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, ...
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0answers
126 views

PostgreSQL problems after vacuum - multiple rows with same pkey, different counts of those rows from seq scan vs index

We tried to run a full vacuum on our Postgres database the other day because of disk problems. A bunch of things went wrong along the way and eventually we stopped the vacuum. Now we have some new ...
2
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1answer
1k views

Is it safe to kill vacuumdb?

I would like to schedule a vacuumdb cron job for an entire database, but I don't want it to run past a certain time. Is it safe to just stop the job with killall vacuumdb?
3
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1answer
2k views

Is VACUUM FULL necessary on a DROP TABLE / TRUNCATE approach for a datawarehouse

We are updating a datawarehouse on a weekly basis using a series of TRUNCATE source_table1 COPY source_table1 FROM [...] ... for data import and: DROP TABLE IF EXISTS my_table CREATE TABLE ...
3
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1answer
546 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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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 | ...
8
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1answer
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 ...
1
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1answer
566 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 ...
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0answers
279 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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0answers
225 views

will vacuumlo find orphaned objects

A Table (mytable) is having 2 columns id_ | loid_ (integer) | (oid) Values are id_ | loid_ 1 | 15001 2 | 15002 Value in loid_ column refers the oid from pg_largeobject. And if I ...
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1answer
708 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 , ...
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1answer
595 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 ...
0
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1answer
189 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 ...
1
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1answer
273 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 ...
1
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1answer
821 views

PostgreSQL Bloat Warning: Vaccuum does not help

We use check_postgres to monitor our DB. We get this warning: POSTGRES_BLOAT WARNING: DB "foo" (db foo) index foo_text_index_id_uniq rows:? pages:485435 shouldbe:330673 (1.5X) wasted bytes:...
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1answer
2k views

Is it worth it to run VACUUM on a table that only receives INSERTs?

In a 2015 re:Invent talk, AWS mentioned that vacuum should be run not only after updates or deletes but also after inserts. Here is the relevant part of the talk: http://www.youtube.com/watch?v=...