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,
161
questions
0
votes
0
answers
277
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 ...
- 750
2
votes
0
answers
143
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 ...
- 111
0
votes
1
answer
2k
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 ...
- 1,910
1
vote
1
answer
175
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 ...
- 750
0
votes
1
answer
327
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 ...
- 101
1
vote
1
answer
617
views
Long running VACUUM VERBOSE 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 ...
- 121
1
vote
2
answers
313
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. ...
- 13
1
vote
2
answers
1k
views
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 ...
- 15
2
votes
1
answer
185
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 ...
- 155
3
votes
0
answers
3k
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 ...
- 249
0
votes
1
answer
303
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,...
- 1
1
vote
1
answer
1k
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 ...
- 55
0
votes
1
answer
649
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 ...
1
vote
1
answer
252
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 ...
- 1,125
3
votes
1
answer
5k
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 ...
- 881
3
votes
1
answer
7k
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 ...
- 187
12
votes
3
answers
9k
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 ...
- 123
1
vote
1
answer
1k
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 ...
- 13
3
votes
1
answer
5k
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 [...
- 137
0
votes
2
answers
201
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 ...
- 35
2
votes
1
answer
2k
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/...
- 211
9
votes
2
answers
1k
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 ...
- 193
3
votes
1
answer
2k
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
--------------------------------------------...
- 897
1
vote
1
answer
641
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 ...
1
vote
1
answer
360
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? ...
- 83
0
votes
0
answers
383
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")
...
1
vote
0
answers
613
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
...
- 123
2
votes
1
answer
3k
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 ...
- 1,125
3
votes
0
answers
1k
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 ...
- 131
2
votes
0
answers
981
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 ...
- 123
5
votes
2
answers
3k
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 "...
- 1,145
1
vote
1
answer
563
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 ...
- 13
2
votes
1
answer
235
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 ...
- 3,503
7
votes
1
answer
4k
views
What performance advantages does append-only postgres allow?
Suppose we have a Postgres Database with only a single table. It is known that no UPDATE statements will ever be run on it, nor will any DELETEs. It is 100% append-only.
Some databases exist that rely ...
- 173
0
votes
1
answer
1k
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 ...
- 111
0
votes
1
answer
124
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 ...
- 101
1
vote
1
answer
582
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 /...
- 21
2
votes
1
answer
2k
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....
- 765
2
votes
1
answer
3k
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 ...
- 41
1
vote
1
answer
167
views
What version of PostgreSQL first implemented autovacuum?
I'm just wondering what version of PostgreSQL first implemented autovacuum.
- 62.1k
2
votes
0
answers
238
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?
- 1,910
2
votes
1
answer
4k
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 (...
- 1,959
4
votes
1
answer
7k
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 ...
- 143
1
vote
1
answer
594
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 ...
- 225
2
votes
1
answer
843
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 ...
- 71
2
votes
1
answer
374
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?
- 66
4
votes
2
answers
6k
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, ...
- 66
1
vote
0
answers
269
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 ...
- 11
2
votes
1
answer
3k
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?
- 121
6
votes
1
answer
8k
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 ...
- 213