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Langue: en

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

Section: 1 (Commandes utilisateur)


clusterdb - cluster a PostgreSQL database


clusterdb [ connection-option... ] [ --verbose | -v ] [ --table | -t table ] [ dbname ]

clusterdb [ connection-option... ] [ --all | -a ] [ --verbose | -v ]


clusterdb is a utility for reclustering tables in a PostgreSQL database. It finds tables that have previously been clustered, and clusters them again on the same index that was last used. Tables that have never been clustered are not affected.

clusterdb is a wrapper around the SQL command CLUSTER [cluster(7)]. There is no effective difference between clustering databases via this utility and via other methods for accessing the server.


clusterdb accepts the following command-line arguments:

Cluster all databases.
[-d] dbname
[--dbname] dbname
Specifies the name of the database to be clustered. 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 clusterdb generates and sends to the server.
Do not display progress messages.
-t table
--table table
Cluster table only.
Print detailed information during processing.

clusterdb 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 clusterdb to prompt for a password before connecting to a database.

This option is never essential, since clusterdb will automatically prompt for a password if the server demands password authentication. However, clusterdb 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 CLUSTER [cluster(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.


To cluster the database test:

 $ clusterdb test

To cluster a single table foo in a database named xyzzy:

 $ clusterdb --table foo xyzzy


CLUSTER [cluster(7)]
> > J'ai configur? KDE sur ma deuxi?me machine
> > mais n'ai pas encore r?ussi ? y mettre mon
> > PASCAL car lorsque je vais dans /mnt/cdrom,
> > il n'indique aucun fichier alors que mon pascal est
> > dessus et en fichier .zip ou .tar.
> mount /mnt/cdrom en tant que root ?

Il est vrai que je n'ai pas utilis? la commande mount.
Toutefois, je ne sais pas ou il faut la tapper.

-- Jayce - dtc? --