PostgreSQL 9.0.3 Documentation
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# 33.3. Closing a Connection

To close a connection, use the following statement:

    EXEC SQL DISCONNECT [connection];

The `connection` can be specified in the following ways:

- ``connection-name``

- `DEFAULT`

- `CURRENT`

- `ALL`

If no connection name is specified, the current connection is closed.

It is good style that an application always explicitly disconnect from every connection it opened.

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