Administración de PostgreSQL
VACUUM (no FULL) - Ejemplo

Tabla original:
+-----------+-----------+-----------+---+
| tupla 1obs|  tupla 2  |  tupla 3  | 0 | pagina 1
+-----------+-----------+-----------+---+
|  tupla 4  |  tupla 5  |  tupla 6  | 0 | pagina 2
+-----------+-----------+-----------+---+
|  tupla 1  |   vacío   |   vacío   |   | pagina 3
+-----------+-----------+-----------+---+
VACUUM
+-----------+-----------+-----------+---+
|  tupla 2  |  tupla 3  |   vacío   | 1 | pagina 1
+-----------+-----------+-----------+---+
|  tupla 4  |  tupla 5  |  tupla 6  | 0 | pagina 2
+-----------+-----------+-----------+---+
|  tupla 1  |   vacío   |   vacío   |   | pagina 3
+-----------+-----------+-----------+---+
                                      ^ FSM