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 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 (...
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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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Aggressive Autovacuum on PostgreSQL
I'm trying to get PostgreSQL to aggressively auto vacuum my database. I've currently configured auto vacuum as follows:
autovacuum_vacuum_cost_delay = 0 #Turn off cost based vacuum
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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 ...
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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 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 unexplained table bloat
I have a table in a Postgres 8.2.15 database. The table bloated to almost 25GB but after running vacuum full and cluster the table size was dramatically smaller, well under 1GB. A few weeks later ...
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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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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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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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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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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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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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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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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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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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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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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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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 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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Dropping indexes doesn't seem to release space to the OS. Can it?
I'm running PostgreSQL 9.1. I have noticed really alarmingly bad indexes are taking up a lot of space on my server, e.g:
evlampts=# SELECT
pg_size_pretty(pg_relation_size('mcdata_2011_07')) AS ...
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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 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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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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"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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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?
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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 ...
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