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CLUSTERDB(1)		PostgreSQL 9.6.19 Documentation		  CLUSTERDB(1)

       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 server.

       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

	   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 32.14,
       "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


PostgreSQL 9.6.19		     2020			  CLUSTERDB(1)


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