PostgreSQL get back storage occupied by deleted tuples or records

PostgreSQL is a free object-relational database server/database management system, released under a flexible BSD-style license. It has features such as Functions, Indexes, Triggers, MVCC and much more.

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With vacuum you can reclaim storage occupied by deleted tuples. In normal PostgreSQL operation, tuples that are deleted or obsolete by an update are not physically removed from their table; they remain present until a VACUUM is done. Therefore, it is necessary to do VACUUM periodically, especially on frequently updated tables.

vacuumdb is a utility for cleaning a PostgreSQL database. vacuumdb will also generate internal statistics used by the PostgreSQL query optimizer.

For example type the following command:
$ vacuumdb -v -z -a
OR
$ vacuumdb -v -z -a -U USERNAME -W

Where,

  • -v: Verbose output
  • -z: Calculate statistics for use by the optimizer
  • -a: Vacuum all databases
  • -U USERNAME: Use USERNAME name to connect as
  • -W: Prompt for password
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