Movatterモバイル変換

clusterdb
Prev	Up	Postgres Pro Client Applications	Home	Next

clusterdb

clusterdb — cluster aPostgres Pro database

Synopsis

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

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

Description

clusterdb is a utility for reclustering tables in aPostgres Pro 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 commandCLUSTER. 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, when-a/--all is not used. If this is not specified, the database name is read from the environment variablePGDATABASE. If that is not set, the user name specified for the connection is used. Thedbname can be aconnection string. If so, connection string parameters will override any conflicting command line options.
-e --echo: Echo the commands thatclusterdb generates and sends to the server.
-q --quiet: Do not display progress messages.
-ttable --table=table: Clustertable only. Multiple tables can be clustered by writing multiple-t switches.
-v --verbose: Print detailed information during processing.
-V --version: Print theclusterdb version and exit.
-? --help: Show help aboutclusterdb command line arguments, and exit.

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

-hhost --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.

-pport --port=port

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

-Uusername --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

Forceclusterdb to prompt for a password before connecting to a database.

This option is never essential, sinceclusterdb 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.

--maintenance-db=dbname

Specifies the name of the database to connect to to discover which databases should be clustered, when-a/--all is used. If not specified, thepostgres database will be used, or if that does not exist,template1 will be used. This can be aconnection string. If so, connection string parameters will override any conflicting command line options. Also, connection string parameters other than the database name itself will be re-used when connecting to other databases.

Environment

PGDATABASE PGHOST PGPORT PGUSER: Default connection parameters

This utility, like most otherPostgres Pro utilities, also uses the environment variables supported bylibpq (seeSection 32.14).

Diagnostics

In case of difficulty, seeCLUSTER andpsql 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 thelibpq front-end library will apply.

Examples

To cluster the databasetest:

$clusterdb test

To cluster a single tablefoo in a database namedxyzzy:

$clusterdb --table=foo xyzzy