Movatterモバイル変換

dropdb
Prev	Up	PostgreSQL Client Applications	Home	Next

dropdb

dropdb — remove aPostgreSQL database

Synopsis

dropdb [connection-option...] [option...]dbname

Description

dropdb destroys an existingPostgreSQL database. The user who executes this command must be a database superuser or the owner of the database.

dropdb is a wrapper around theSQL command DROP DATABASE. There is no effective difference between dropping databases via this utility and via other methods for accessing the server.

Options

dropdb accepts the following command-line arguments:

dbname: Specifies the name of the database to be removed.
-e --echo: Echo the commands thatdropdb generates and sends to the server.
-f --force: Attempt to terminate all existing connections to the target database before dropping it. SeeDROP DATABASE for more information on this option.
-i --interactive: Issues a verification prompt before doing anything destructive.
-V --version: Print thedropdb version and exit.
--if-exists: Do not throw an error if the database does not exist. A notice is issued in this case.
-? --help: Show help aboutdropdb command line arguments, and exit.

dropdb 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

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

This option is never essential, sincedropdb will automatically prompt for a password if the server demands password authentication. However,dropdb 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 in order to drop the target database. If not specified, thepostgres database will be used; if that does not exist (or is the database being dropped),template1 will be used. This can be aconnection string. If so, connection string parameters will override any conflicting command line options.

Environment

PGHOST PGPORT PGUSER: Default connection parameters
PG_COLOR: Specifies whether to use color in diagnostic messages. Possible values arealways,auto andnever.

This utility, like most otherPostgreSQL utilities, also uses the environment variables supported bylibpq (seeSection 32.15).

Diagnostics

In case of difficulty, seeDROP DATABASE 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 destroy the databasedemo on the default database server:

$dropdb demo

To destroy the databasedemo using the server on hosteden, port 5000, with verification and a peek at the underlying command:

$dropdb -p 5000 -h eden -i -e demoDatabase "demo" will be permanently deleted.Are you sure? (y/n)yDROP DATABASE demo;