|The PostgreSQL 9.0 Reference Manual - Volume 1B - SQL Command Reference
by The PostgreSQL Global Development Group
Paperback (6"x9"), 488 pages
RRP £14.95 ($19.95)
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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
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.
Specifies the name of the database to be clustered.
If this is not specified and
--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.
- Cluster table only.
- 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:
- 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.
- Specifies the TCP port or local Unix domain socket file extension on which the server is listening for connections.
- 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 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
-Wto avoid the extra connection attempt.
- Default connection parameters
This utility, like most other PostgreSQL utilities, also uses the environment variables supported by libpq (see Volume 2: Environment Variables).
In case of difficulty, see
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
$ clusterdb test
To cluster a single table
foo in a database named
$ clusterdb --table foo xyzzy
|ISBN 9781906966058||The PostgreSQL 9.0 Reference Manual - Volume 1B - SQL Command Reference||See the print edition|