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createdb
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createdb

createdb — create a newPostgreSQL database

Synopsis

createdb [connection-option...] [option...] [dbname [description]]

Description

createdb creates a newPostgreSQL database.

Normally, the database user who executes this command becomes the owner of the new database. However, a different owner can be specified via the-O option, if the executing user has appropriate privileges.

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

Options

createdb accepts the following command-line arguments:

dbname: Specifies the name of the database to be created. The name must be unique among allPostgreSQL databases in this cluster. The default is to create a database with the same name as the current system user.
description: Specifies a comment to be associated with the newly created database.
-Dtablespace --tablespace=tablespace: Specifies the default tablespace for the database. (This name is processed as a double-quoted identifier.)
-e --echo: Echo the commands thatcreatedb generates and sends to the server.
-Eencoding --encoding=encoding: Specifies the character encoding scheme to be used in this database. The character sets supported by thePostgreSQL server are described inSection 23.3.1.
-llocale --locale=locale: Specifies the locale to be used in this database. This is equivalent to specifying--lc-collate,--lc-ctype, and--icu-locale to the same value. Some locales are only valid for ICU and must be set with--icu-locale.
--lc-collate=locale: Specifies the LC_COLLATE setting to be used in this database.
--lc-ctype=locale: Specifies the LC_CTYPE setting to be used in this database.
--builtin-locale=locale: Specifies the locale name when the builtin provider is used. Locale support is described inSection 23.1.
--icu-locale=locale: Specifies the ICU locale ID to be used in this database, if the ICU locale provider is selected.
--icu-rules=rules: Specifies additional collation rules to customize the behavior of the default collation of this database. This is supported for ICU only.
--locale-provider={builtin|libc|icu}: Specifies the locale provider for the database's default collation.
-Oowner --owner=owner: Specifies the database user who will own the new database. (This name is processed as a double-quoted identifier.)
-Sstrategy --strategy=strategy: Specifies the database creation strategy. SeeCREATE DATABASE STRATEGY for more details.
-Ttemplate --template=template: Specifies the template database from which to build this database. (This name is processed as a double-quoted identifier.)
-V --version: Print thecreatedb version and exit.
-? --help: Show help aboutcreatedb command line arguments, and exit.

The options-D,-l,-E,-O, and-T correspond to options of the underlying SQL commandCREATE DATABASE; see there for more information about them.

createdb 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 the 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

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

This option is never essential, sincecreatedb will automatically prompt for a password if the server demands password authentication. However,createdb 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 when creating the new database. If not specified, thepostgres database will be used; if that does not exist (or if it is the name of the new database being created),template1 will be used. This can be aconnection string. If so, connection string parameters will override any conflicting command line options.

Environment

PGDATABASE: If set, the name of the database to create, unless overridden on the command line.
PGHOST PGPORT PGUSER: Default connection parameters.PGUSER also determines the name of the database to create, if it is not specified on the command line or byPGDATABASE.
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, seeCREATE 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 create the databasedemo using the default database server:

$createdb demo

To create the databasedemo using the server on hosteden, port 5000, using thetemplate0 template database, here is the command-line command and the underlying SQL command:

$createdb -p 5000 -h eden -T template0 -e demoCREATE DATABASE demo TEMPLATE template0;