Skip site navigation (1) Skip section navigation (2)

Re: [HACKERS] why the DB file size does not reduce when 'delete' the data in DB?

From: Hannu Krosing <hannu(at)tm(dot)ee>
To: Jaruwan Laongmal <jaruwan(at)gits(dot)net(dot)th>
Cc: pgsql-hackers(at)postgresql(dot)org, pgsql-sql(at)postgresql(dot)org
Subject: Re: [HACKERS] why the DB file size does not reduce when 'delete' the data in DB?
Date: 2001-03-02 15:03:05
Message-ID: 3A9FB629.4080601@tm.ee (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-sql
Jaruwan Laongmal wrote:

> I had deleted a very large number of records out of my SQL table in order to
> decrease the harddisk space.  But after I use command 'ls -l
> /usr/local/pgsql/data/base/', it is found that the size of concerning files
> do not reduce due to the effect of 'delete' SQL command.  What should I do
> if I would like to decrease the harddisk space?

Run the command VACUUM;

This will do the actual removal of deleted records. DELETE just marks 
them as deleted

> I am looking forward to your response.  Thank you very much for any help.
> -
> Jaruwan



In response to

pgsql-hackers by date

Next:From: Tom LaneDate: 2001-03-02 15:37:51
Subject: WAL & RC1 status
Previous:From: Thomas LockhartDate: 2001-03-02 13:30:38
Subject: Re: [HACKERS] why the DB file size does not reduce when 'delete' the data in DB?

pgsql-sql by date

Next:From: Jan WieckDate: 2001-03-02 15:34:02
Subject: Re: Help creating rules/triggers/functions
Previous:From: Salvador MainéDate: 2001-03-02 14:57:11
Subject: Re: dates in functions

Privacy Policy | About PostgreSQL
Copyright © 1996-2014 The PostgreSQL Global Development Group