NAME

       clusterdb - cluster a PostgreSQL database

SYNOPSIS

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

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

DESCRIPTION

           Note
           The following description applies both to Postgres-XC and PostgreSQL if not described explicitly.

       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 server.

OPTIONS

       clusterdb accepts the following command-line arguments:

       -a, --all
           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.

       -e, --echo
           Echo the commands that clusterdb generates and sends to the server.

       -q, --quiet
           Do not display progress messages.

       -t table, --table=table
           Cluster table only.

       -v, --verbose
           Print detailed information during processing.

       -V, --version
           Print the clusterdb version and exit.

       -?, --help
           Show help about clusterdb command line arguments, and exit.

       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.

       -w, --no-password
           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.

       -W, --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.

ENVIRONMENT

       PGDATABASE, PGHOST, PGPORT, PGUSER
           Default connection parameters

       This utility, like most other PostgreSQL utilities, also uses the environment variables supported by
       libpq (see Section 32.14, “Environment Variables”, in the documentation).

DIAGNOSTICS

       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.

EXAMPLES

       To cluster the database test:

           $ clusterdb test

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

           $ clusterdb --table foo xyzzy

SEE ALSO

       CLUSTER(7)