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

From: Thomas Lockhart <lockhart(at)alumni(dot)caltech(dot)edu>
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 13:30:38
Message-ID: 3A9FA07E.AB3A6DB6@alumni.caltech.edu (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-sql
> 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 "vacuum" from SQL or "vacuumdb" from the command line. Tables will
be reduced in size, though currently indices are not.

                        - Thomas

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