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Re: [HACKERS] why the DB file size does not reduce when 'delete' the data in DB? - Mailing list pgsql-sql

From Thomas Lockhart
Subject Re: [HACKERS] why the DB file size does not reduce when 'delete' the data in DB?
Date
Msg-id 3A9FA07E.AB3A6DB6@alumni.caltech.edu
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In response to why the DB file size does not reduce when 'delete' the data in DB?  ("Jaruwan Laongmal" <jaruwan@gits.net.th>)
List pgsql-sql
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> 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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