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                GNU Free Documentation License
                 Version 1.3, 3 November 2008

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    The VACUUM instruction is used by PostgreSQL to query the server in cleaning up the corresponding database cluster. The work done is simply to remove the unused rows and clearly mark them are available. The VACUUM FULL command will go the extra distance of pushing the data so as to make the tables as small as possible. The command can be run on a per table basis.