CLUSTERDB(1) PostgreSQL Client Applications CLUSTERDB(1)
NAME clusterdb - cluster a PostgreSQL database
SYNOPSIS clusterdb [ connection-option... ] [ --verbose | -v ] [ --table | -t table ] [ dbname ]
clusterdb [ connection-option... ] [ --all | -a ] [ --verbose | -v ]
DESCRIPTION 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.
OPTIONS clusterdb accepts the following command-line arguments:
--all Cluster all databases.
[--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 Echo the commands that clusterdb generates and sends to the server.
--quiet Do not display progress messages.
--table table Cluster table only.
--verbose Print detailed information during processing.
clusterdb also accepts the following command-line arguments for connec- tion parameters:
--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.
--port port Specifies the TCP port or local Unix domain socket file exten- sion on which the server is listening for connections.
--username username User name to connect as.
--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.
--password Force clusterdb to prompt for a password before connecting to a database.
This option is never essential, since clusterdb will automati- cally 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.
PGUSER Default connection parameters
This utility, like most other PostgreSQL utilities, also uses the envi- ronment variables supported by libpq (see in the documentation).
DIAGNOSTICS In case of difficulty, see CLUSTER [cluster(7)] and psql(1) for discus- sions of potential problems and error messages. The database server must be running at the targeted host. Also, any default connection set- tings 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 [cluster(7)]
Application 2011-09-22 CLUSTERDB(1)