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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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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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 | ...
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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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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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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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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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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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1
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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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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 ...
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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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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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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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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 / ...
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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 ...
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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....
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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 ...
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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 ...
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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 ...
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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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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 ...
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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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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 ...
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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 ...
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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, ...
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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 ...
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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 ...
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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 ...
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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 ...
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Postgres table growing on massive updates
I have an issue with my postgres database, I'm running massive update queries (1000 per second) to a single table (with 3000 entries) and I can see that the size of that table is growing and growing ...
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Amazon Redshift VACUUM error
I'm trying to run vacuum delete only on a table with big amount of columns (800+) and 4 million rows.
I know it's recommended to use deep copy instead, but still am wondering if running vacuum is ...
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Does postgres efficiently re-use space from deleted rows?
From the docs:
In PostgreSQL, an UPDATE or DELETE of a row does not immediately remove the old version of the row [...] But eventually, an outdated or deleted row version is no longer of interest ...
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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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PostgreSQL 9.1: vacuumdb vs. autovacuum
Have a question on the difference between just allowing autovacuum to take care of vacuum'ing or having to run a full db vacuum in a certain interval (every night?, every week?).
We used to run a ...
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Postgresql 9.2 - Auto vacuum running continuously for 18+ hours
I currently have a table that is updated daily (easily 20%+ rows are updated, all floats/integers) and the vacuum is kicking off and running for more than 18 hours. There are 19 million rows total.
...
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VACUUM FREEZE vs. VACUUM FULL
Can someone explain the difference between these types of VACUUM in PostgreSQL?
I read the doc but it just says that FULL locks the tables and FREEZE "freezes" the tuples. I think that's the same. Am ...
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Stubborn autovacuum process slow things dows
We are facing a strange problem since yesterday.
In a database of ours there is a partitioned table containing historical data. That is, every week's data goes to a different partition and stays ...
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Vacuum settings for mostly append-only data
I have a table with the following characteristics:
We INSERT a few 100k rows each day
We never UPDATE the rows
We DELETE "old" data once a week
From my shallow knowledge of Postgres VACUUM, it seems ...
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Vacuum vs Auto Vacuum
I am trying to find answers for my below few queries which will help me in fine tuning my postgres DB. I did some googling but was not able to find answer.
1) Out of vacuum or Auto vacuum which is ...
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PostgreSQL maintenance
I am new to PostgreSQL and want to know more about maintenance options in pgAdmin III.
I've read the documentation and now I know that vacuuming frees some space and I need to run it regularly. ...
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Which all system parameters to be considered for standard Vacuum process
We want to run standard vacuum process on our production database which is over 100 GB and have millions of dead tuples.
Can anyone suggest what system parameters we need to keep in mind for setting ...
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PostgreSQL strategies to deal with disk filling up
I'm using PostgreSQL (8.4) to store data produced by an application making frequent inserts (in the table structure described below).
The database keeps growing with time and, since the newer data is ...
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PostgreSQL difference between VACUUM FULL and CLUSTER
I have a table with 200 GB of size occupied by data and 180 GB of size by the 6 indexes on it. It is 30% bloated, so I want to reclaim unwanted space occupied by it. It is clustered on job_id_idx ...
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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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"Truncate" or "Delete/Vacuum Full" for deleting some of the table rows
I have a db which has 223 tables and I have to delete some of the records from 10 of them, each has apprx. 1.5million records. Those tables are storing the temperatures every 7seconds. We have decided ...
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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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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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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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Slow access to table in postgresql despite vacuum
I'm running PG 8.4
I had a table with about 20K records. Any query accessing this table with more than 1 record (e.g. joins) would be very very slow. Even a count would take like 20 seconds.
Stats ...
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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 ...
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Postgres not vacuuming 1 table
I have created a table where I store serialized Java objects. They are frequently accessed and costly to create, so that is the reason. Solution works fine to me, however table size grows to 25GB ...
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