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PostgreSQL: Is a VACUUM ANALYZE required after CLUSTER?

In Postgres 9.5 or later is it necessary to do a VACUUM ANALYZE my_table after a CLUSTER my_table USING my_idx if my table statistics were analyzed and up-to-date before issuing the CLUSTER command? ...
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1answer
32 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
44 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 ...
0
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1answer
87 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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0answers
38 views

iOS SMS.db - limits of vacuuming

Considering this is an sql question, I thought I'd have more luck here rather than in the Apple section. A bit of background: iOS SMS.db is a sqlite db that, as the name suggests, holds messages (SMS ...
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1answer
33 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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0answers
39 views

Auto Vacuum not cleaning tables, will Vaccum Full fix this issue?

So the auto vacuum daemon is hitting the tables in my database, but is not cleaning up the dead tuples. I believe this is because there is a long lasting connection or query of some sort. ...
1
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1answer
43 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
222 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
358 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
32 views

What version of PostgreSQL first implemented autovacuum?

I'm just wondering what version of PostgreSQL first implemented autovacuum.
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0answers
38 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?
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1answer
413 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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0answers
34 views

Compute bytes count occupied by surviving cells of a table [closed]

Let there be a table that grows to 5MiB. After being VACUUMed let there be about 2MiB worth of DELETEd rows that is available for data in that table before starting storage claims to the operating ...
1
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1answer
1k 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
270 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
224 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
118 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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1answer
1k 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
93 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 ...
3
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1answer
577 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?
2
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1answer
1k 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 ...
4
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1answer
381 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
3k 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 | ...
5
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1answer
5k 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 ...
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1answer
365 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
162 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
177 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 ...
1
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1answer
671 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
371 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
105 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
185 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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1answer
523 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
1k 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=...
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1answer
658 views

In PostgreSQL, will VACUUM reset the dead tuple count (n_dead_tup in pg_stat_all_tables)?

In PostgreSQL, will VACUUM reset the dead tuple count (n_dead_tup in pg_stat_all_tables)? The situation I'm seeing is that vacuum is apparently being run manually, once daily, and the n_dead_tup / ...
1
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1answer
2k views

How to reduce size of PostgreSQL table after dropping columns?

I have a PostgreSQL database. One table is very large. I want to extract a TEXT column into a separate table and see how much I can reduce the size. The problem is that the size appears to stay the ...
1
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1answer
1k views

What are “nonremovable row versions”?

I did full vacuum on postgresql-9.4 database and I have a lot of tables with nonremovable row versions. I would like to know what are these or where I can read about them. INFO: vacuuming "public....
5
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1answer
2k views

Reclaim disk space from dropped column without downtime

I have a heavily used table (with around 5 million rows) in a PostgreSQL database in which I want to drop a column and reclaim the space the column used. The docs suggest doing a table rewriting ...
6
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1answer
4k views

PostgeSQL 9.3: Is it safe to stop VACUUM FULL?

I'm using PostgreSQL 9.3 on RDS. Once in a while, I run a VACUUM FULL operation on the database. However, such operation can take quite a while and it blocks other tables, so the need to stop the ...
9
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1answer
235 views

How to reclaim space taken by an index that partially built and was terminated by a power outage

I'm running postgres (postgis) 9.4.2 on a mac (10.10.4). I've got a couple big tables (several TBs). During an index build on one of them that takes about a week, I watched the available HD space ...
3
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1answer
2k views

Does VACUUM FULL need ANALYZE

I'd be grateful for some insight into the VACUUM functionality within PostgreSQL 9.3. I read through the documentation and searched around a bit but could not find a definitive answer to this. I'm ...
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1answer
83 views

Should I use VACUUM on a SQLite db with a log-structured filesystem?

I'm runnig a SQLite database on nilfs (which is a log-structured filesystem). Every now and then I delete old records, so that the size of the database never surpass a certain amount. But since the ...
3
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1answer
3k views

VACUUM FULL fails with 'ERROR: Check free disk space'

I am using Postgres 9.4. I have a database that \l+ tells me is 164 GB. When I try to run VACUUM FULL on the database, I get this error (after many hours): ERROR: could not extend file "base/18222/...
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1answer
2k views

When is Postgres autovacuum executed

I am using an older version of Postgres (8.4.20). I know that the autovacuum process is executed frequently to free disk space of queries that deleted or updated data in tables. I have a database ...
7
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2answers
10k views

Why wouldn't VACUUM ANALYZE clear all dead tuples?

We run a "manual" VACUUM ANALYZE VERBOSE on some of our larger tables after we do major DELETE/INSERT changes to them. This seems to work without issue although sometimes a table's VACUUM job will run ...
4
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1answer
347 views

How do databases deal with file system fragmentation?

Especially analytic databases that try to optimize for queries that scan large portions of tables instead of randomly accessing specific rows. For example Redshift has a concept of a sort key that, ...
2
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4answers
2k 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 ...
11
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1answer
2k views

Busy table is not getting vacuumed

We're using Postgres 9.2 on Windows to store low-frequency timeseries data: we're inserting around 2000 rows per second every second 24 hours, 7 days a week with no downtime. There is a DELETE that ...
5
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1answer
827 views

For alignment optimized table is bigger than original table - why?

In another question I learned that I should optimize the layout from one of my tables to save space and have better performance. I did this, but ended up with a larger table than before and ...
1
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1answer
568 views

Will insert and update wait while a table is being vacuumed?

I want to vacuum a table in PostgreSQL version 9.1 which will take between 10 to 12 minutes. This needs to be done in real-time, in production use. I just want to know that if any INSERT or UPDATE ...