Langue: en

Version: 2010-10-01 (fedora - 01/12/10)

Section: 1 (Commandes utilisateur)


vacuumdb - garbage-collect and analyze a PostgreSQL database


vacuumdb [ connection-option... ] [ --full | -f ] [ --verbose | -v ] [ --analyze | -z ] [ --freeze | -F ] [ --table | -t table
 [ ( 
column [,...] ) ]  ] [ dbname ]

vacuumdb [ connection-options... ] [ --all | -a ] [ --full | -f ] [ --verbose | -v ] [ --analyze | -z ] [ --freeze | -F ]


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

vacuumdb is a wrapper around the SQL command VACUUM [vacuum(7)]. There is no effective difference between vacuuming databases via this utility and via other methods for accessing the server.


vacuumdb accepts the following command-line arguments:

Vacuum all databases.
[-d] dbname
[--dbname] dbname
Specifies the name of the database to be cleaned or analyzed. If this is not specified and -a (or --all) is not used, the database name is read from the environment variable PGDATABASE. If that is not set, the user name specified for the connection is used.
Echo the commands that vacuumdb generates and sends to the server.
Perform ``full'' vacuuming.
Do not display progress messages.
-t table [ (column [,...]) ]
--table table [ (column [,...]) ]
Clean or analyze table only. Column names can be specified only in conjunction with the --analyze option.
Tip: If you specify columns, you probably have to escape the parentheses from the shell. (See examples below.)
Print detailed information during processing.
Calculate statistics for use by the optimizer.
Aggressively ``freeze'' tuples.

vacuumdb also accepts the following command-line arguments for connection parameters:

-h host
--host host
Specifies the host name of the machine on which the server is running. If the value begins with a slash, it is used as the directory for the Unix domain socket.
-p port
--port port
Specifies the TCP port or local Unix domain socket file extension on which the server is listening for connections.
-U username
--username username
User name to connect as.
Never issue a password prompt. If the server requires password authentication and a password is not available by other means such as a .pgpass file, the connection attempt will fail. This option can be useful in batch jobs and scripts where no user is present to enter a password.
Force vacuumdb to prompt for a password before connecting to a database.

This option is never essential, since vacuumdb will automatically prompt for a password if the server demands password authentication. However, vacuumdb will waste a connection attempt finding out that the server wants a password. In some cases it is worth typing -W to avoid the extra connection attempt.


Default connection parameters

This utility, like most other PostgreSQL utilities, also uses the environment variables supported by libpq (see in the documentation).


In case of difficulty, see VACUUM [vacuum(7)] and psql(1) for discussions of potential problems and error messages. The database server must be running at the targeted host. Also, any default connection settings and environment variables used by the libpq front-end library will apply.


vacuumdb might need to connect several times to the PostgreSQL server, asking for a password each time. It is convenient to have a ~/.pgpass file in such cases. See in the documentation for more information.


To clean the database test:

 $ vacuumdb test

To clean and analyze for the optimizer a database named bigdb:

 $ vacuumdb --analyze bigdb

To clean a single table foo in a database named xyzzy, and analyze a single column bar of the table for the optimizer:

 $ vacuumdb --analyze --verbose --table 'foo(bar)' xyzzy


VACUUM [vacuum(7)]