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clusterdb - Online in the Cloud

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This is the command clusterdb that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



clusterdb - cluster a PostgreSQL database


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

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


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(7). There is no effective difference
between clustering databases via this utility and via other methods for accessing the


clusterdb accepts the following command-line arguments:

Cluster all databases.

[-d] 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
Cluster table only. Multiple tables can be clustered by writing multiple -t switches.

Print detailed information during processing.

Print the clusterdb version and exit.

Show help about clusterdb command line arguments, and exit.

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

-h 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
Specifies the TCP port or local Unix domain socket file extension on which the server
is listening for connections.

-U 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.

Specifies the name of the database to connect to discover what other databases should
be clustered. If not specified, the postgres database will be used, and if that does
not exist, template1 will be used.


Default connection parameters

This utility, like most other PostgreSQL utilities, also uses the environment variables
supported by libpq (see Section 31.14, “Environment Variables”, in the documentation).


In case of difficulty, see 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

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