clusterdb [connection-options...] [--table | -t
table ] [dbname]
clusterdb [connection-options...] [--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 touched.
clusterdb is a shell script wrapper around the backend command CLUSTER via the PostgreSQL interactive terminal psql. There is no effective difference between clustering databases via this or other methods. psql must be found by the script and a database server must be running at the targeted host. Also, any default settings and environment variables available to psql and the libpq front-end library do apply.
clusterdb might need to connect several times to the PostgreSQL server, asking for a password each time. It is convenient to have a $HOME/.pgpass file in such cases.
clusterdb accepts the following command-line arguments:
-a--allCluster all databases.
[-d]
dbname[--dbname]
dbnameSpecifies 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--echoEcho the commands that clusterdb generates and sends to the server.
-q--quietDo not display a response.
-t table--table tableClusters table only.
clusterdb also accepts the following command-line arguments for connection parameters:
-h host--host hostSpecifies the host name of the machine on which the server is running. If host begins with a slash, it is used as the directory for the Unix domain socket.
-p port--port portSpecifies the Internet TCP/IP port or local Unix domain socket file extension on which the server is listening for connections.
-U username--username usernameUser name to connect as
-W--passwordForce password prompt.