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INITDB(1)			  PostgreSQL 9.2.7 Documentation			INITDB(1)

NAME
       initdb - create a new PostgreSQL database cluster

SYNOPSIS
       initdb [option...] [--pgdata | -D] directory

DESCRIPTION
       initdb creates a new PostgreSQL database cluster. A database cluster is a collection of
       databases that are managed by a single server instance.

       Creating a database cluster consists of creating the directories in which the database
       data will live, generating the shared catalog tables (tables that belong to the whole
       cluster rather than to any particular database), and creating the template1 and postgres
       databases. When you later create a new database, everything in the template1 database is
       copied. (Therefore, anything installed in template1 is automatically copied into each
       database created later.) The postgres database is a default database meant for use by
       users, utilities and third party applications.

       Although initdb will attempt to create the specified data directory, it might not have
       permission if the parent directory of the desired data directory is root-owned. To
       initialize in such a setup, create an empty data directory as root, then use chown to
       assign ownership of that directory to the database user account, then su to become the
       database user to run initdb.

       initdb must be run as the user that will own the server process, because the server needs
       to have access to the files and directories that initdb creates. Since the server cannot
       be run as root, you must not run initdb as root either. (It will in fact refuse to do so.)

       initdb initializes the database cluster's default locale and character set encoding. The
       character set encoding, collation order (LC_COLLATE) and character set classes (LC_CTYPE,
       e.g. upper, lower, digit) can be set separately for a database when it is created.  initdb
       determines those settings for the template1 database, which will serve as the default for
       all other databases.

       To alter the default collation order or character set classes, use the --lc-collate and
       --lc-ctype options. Collation orders other than C or POSIX also have a performance
       penalty. For these reasons it is important to choose the right locale when running initdb.

       The remaining locale categories can be changed later when the server is started. You can
       also use --locale to set the default for all locale categories, including collation order
       and character set classes. All server locale values (lc_*) can be displayed via SHOW ALL.
       More details can be found in Section 22.1, "Locale Support", in the documentation.

       To alter the default encoding, use the --encoding. More details can be found in Section
       22.3, "Character Set Support", in the documentation.

OPTIONS
       -A authmethod, --auth=authmethod
	   This option specifies the authentication method for local users used in pg_hba.conf
	   (host and local lines). Do not use trust unless you trust all local users on your
	   system.  trust is the default for ease of installation.

       --auth-host=authmethod
	   This option specifies the authentication method for local users via TCP/IP connections
	   used in pg_hba.conf (host lines).

       --auth-local=authmethod
	   This option specifies the authentication method for local users via Unix-domain socket
	   connections used in pg_hba.conf (local lines).

       -D directory, --pgdata=directory
	   This option specifies the directory where the database cluster should be stored. This
	   is the only information required by initdb, but you can avoid writing it by setting
	   the PGDATA environment variable, which can be convenient since the database server
	   (postgres) can find the database directory later by the same variable.

       -E encoding, --encoding=encoding
	   Selects the encoding of the template database. This will also be the default encoding
	   of any database you create later, unless you override it there. The default is derived
	   from the locale, or SQL_ASCII if that does not work. The character sets supported by
	   the PostgreSQL server are described in Section 22.3.1, "Supported Character Sets", in
	   the documentation.

       --locale=locale
	   Sets the default locale for the database cluster. If this option is not specified, the
	   locale is inherited from the environment that initdb runs in. Locale support is
	   described in Section 22.1, "Locale Support", in the documentation.

       --lc-collate=locale, --lc-ctype=locale, --lc-messages=locale, --lc-monetary=locale,
       --lc-numeric=locale, --lc-time=locale
	   Like --locale, but only sets the locale in the specified category.

       --no-locale
	   Equivalent to --locale=C.

       --pwfile=filename
	   Makes initdb read the database superuser's password from a file. The first line of the
	   file is taken as the password.

       -T CFG, --text-search-config=CFG
	   Sets the default text search configuration. See default_text_search_config for further
	   information.

       -U username, --username=username
	   Selects the user name of the database superuser. This defaults to the name of the
	   effective user running initdb. It is really not important what the superuser's name
	   is, but one might choose to keep the customary name postgres, even if the operating
	   system user's name is different.

       -W, --pwprompt
	   Makes initdb prompt for a password to give the database superuser. If you don't plan
	   on using password authentication, this is not important. Otherwise you won't be able
	   to use password authentication until you have a password set up.

       -X directory, --xlogdir=directory
	   This option specifies the directory where the transaction log should be stored.

       Other, less commonly used, options are also available:

       -d, --debug
	   Print debugging output from the bootstrap backend and a few other messages of lesser
	   interest for the general public. The bootstrap backend is the program initdb uses to
	   create the catalog tables. This option generates a tremendous amount of extremely
	   boring output.

       -L directory
	   Specifies where initdb should find its input files to initialize the database cluster.
	   This is normally not necessary. You will be told if you need to specify their location
	   explicitly.

       -n, --noclean
	   By default, when initdb determines that an error prevented it from completely creating
	   the database cluster, it removes any files it might have created before discovering
	   that it cannot finish the job. This option inhibits tidying-up and is thus useful for
	   debugging.

       Other options:

       -s, --show
	   Print the internal settings, then exit.

       -V, --version
	   Print the initdb version and exit.

       -?, --help
	   Show help about initdb command line arguments, and exit.

ENVIRONMENT
       PGDATA
	   Specifies the directory where the database cluster is to be stored; can be overridden
	   using the -D option.

       This utility, like most other PostgreSQL utilities, also uses the environment variables
       supported by libpq (see Section 31.14, "Environment Variables", in the documentation).

NOTES
       initdb can also be invoked via pg_ctl initdb.

SEE ALSO
       pg_ctl(1), postgres(1)

PostgreSQL 9.2.7			    2014-02-17					INITDB(1)
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