NAME

       CREATE_DATABASE - create a new database

SYNOPSIS

       CREATE DATABASE name
           [ WITH ] [ OWNER [=] user_name ]
                  [ TEMPLATE [=] template ]
                  [ ENCODING [=] encoding ]
                  [ STRATEGY [=] strategy ]
                  [ LOCALE [=] locale ]
                  [ LC_COLLATE [=] lc_collate ]
                  [ LC_CTYPE [=] lc_ctype ]
                  [ BUILTIN_LOCALE [=] builtin_locale ]
                  [ ICU_LOCALE [=] icu_locale ]
                  [ ICU_RULES [=] icu_rules ]
                  [ LOCALE_PROVIDER [=] locale_provider ]
                  [ COLLATION_VERSION = collation_version ]
                  [ TABLESPACE [=] tablespace_name ]
                  [ ALLOW_CONNECTIONS [=] allowconn ]
                  [ CONNECTION LIMIT [=] connlimit ]
                  [ IS_TEMPLATE [=] istemplate ]
                  [ OID [=] oid ]

DESCRIPTION

       CREATE DATABASE creates a new PostgreSQL database.

       To create a database, you must be a superuser or have the special CREATEDB privilege. See
       CREATE ROLE (CREATE_ROLE(7)).

       By default, the new database will be created by cloning the standard system database
       template1. A different template can be specified by writing TEMPLATE name. In particular,
       by writing TEMPLATE template0, you can create a pristine database (one where no
       user-defined objects exist and where the system objects have not been altered) containing
       only the standard objects predefined by your version of PostgreSQL. This is useful if you
       wish to avoid copying any installation-local objects that might have been added to
       template1.

PARAMETERS

       name
           The name of a database to create.

       user_name
           The role name of the user who will own the new database, or DEFAULT to use the default
           (namely, the user executing the command). To create a database owned by another role,
           you must be able to SET ROLE to that role.

       template
           The name of the template from which to create the new database, or DEFAULT to use the
           default template (template1).

       encoding
           Character set encoding to use in the new database. Specify a string constant (e.g.,
           'SQL_ASCII'), or an integer encoding number, or DEFAULT to use the default encoding
           (namely, the encoding of the template database). The character sets supported by the
           PostgreSQL server are described in Section 23.3.1. See below for additional
           restrictions.

       strategy
           Strategy to be used in creating the new database. If the WAL_LOG strategy is used, the
           database will be copied block by block and each block will be separately written to
           the write-ahead log. This is the most efficient strategy in cases where the template
           database is small, and therefore it is the default. The older FILE_COPY strategy is
           also available. This strategy writes a small record to the write-ahead log for each
           tablespace used by the target database. Each such record represents copying an entire
           directory to a new location at the filesystem level. While this does reduce the
           write-ahead log volume substantially, especially if the template database is large, it
           also forces the system to perform a checkpoint both before and after the creation of
           the new database. In some situations, this may have a noticeable negative impact on
           overall system performance.

       locale
           Sets the default collation order and character classification in the new database.
           Collation affects the sort order applied to strings, e.g., in queries with ORDER BY,
           as well as the order used in indexes on text columns. Character classification affects
           the categorization of characters, e.g., lower, upper, and digit. Also sets the
           associated aspects of the operating system environment, LC_COLLATE and LC_CTYPE. The
           default is the same setting as the template database. See Section 23.2.2.3.1 and
           Section 23.2.2.3.2 for details.

           Can be overridden by setting lc_collate, lc_ctype, builtin_locale, or icu_locale
           individually.

           If locale_provider is builtin, then locale or builtin_locale must be specified and set
           to either C or C.UTF-8.

               Tip
               The other locale settings lc_messages, lc_monetary, lc_numeric, and lc_time are
               not fixed per database and are not set by this command. If you want to make them
               the default for a specific database, you can use ALTER DATABASE ... SET.

       lc_collate
           Sets LC_COLLATE in the database server's operating system environment. The default is
           the setting of locale if specified, otherwise the same setting as the template
           database. See below for additional restrictions.

           If locale_provider is libc, also sets the default collation order to use in the new
           database, overriding the setting locale.

       lc_ctype
           Sets LC_CTYPE in the database server's operating system environment. The default is
           the setting of locale if specified, otherwise the same setting as the template
           database. See below for additional restrictions.

           If locale_provider is libc, also sets the default character classification to use in
           the new database, overriding the setting locale.

       builtin_locale
           Specifies the builtin provider locale for the database default collation order and
           character classification, overriding the setting locale. The locale provider must be
           builtin. The default is the setting of locale if specified; otherwise the same setting
           as the template database.

           The locales available for the builtin provider are C and C.UTF-8.

       icu_locale
           Specifies the ICU locale (see Section 23.2.2.3.2) for the database default collation
           order and character classification, overriding the setting locale. The locale provider
           must be ICU. The default is the setting of locale if specified; otherwise the same
           setting as the template database.

       icu_rules
           Specifies additional collation rules to customize the behavior of the default
           collation of this database. This is supported for ICU only. See Section 23.2.3.4 for
           details.

       locale_provider
           Specifies the provider to use for the default collation in this database. Possible
           values are builtin, icu (if the server was built with ICU support) or libc. By
           default, the provider is the same as that of the template. See Section 23.1.4 for
           details.

       collation_version
           Specifies the collation version string to store with the database. Normally, this
           should be omitted, which will cause the version to be computed from the actual version
           of the database collation as provided by the operating system. This option is intended
           to be used by pg_upgrade for copying the version from an existing installation.

           See also ALTER DATABASE (ALTER_DATABASE(7)) for how to handle database collation
           version mismatches.

       tablespace_name
           The name of the tablespace that will be associated with the new database, or DEFAULT
           to use the template database's tablespace. This tablespace will be the default
           tablespace used for objects created in this database. See CREATE TABLESPACE
           (CREATE_TABLESPACE(7)) for more information.

       allowconn
           If false then no one can connect to this database. The default is true, allowing
           connections (except as restricted by other mechanisms, such as GRANT/REVOKE CONNECT).

       connlimit
           How many concurrent connections can be made to this database. -1 (the default) means
           no limit.

       istemplate
           If true, then this database can be cloned by any user with CREATEDB privileges; if
           false (the default), then only superusers or the owner of the database can clone it.

       oid
           The object identifier to be used for the new database. If this parameter is not
           specified, PostgreSQL will choose a suitable OID automatically. This parameter is
           primarily intended for internal use by pg_upgrade, and only pg_upgrade can specify a
           value less than 16384.

       Optional parameters can be written in any order, not only the order illustrated above.

NOTES

       CREATE DATABASE cannot be executed inside a transaction block.

       Errors along the line of “could not initialize database directory” are most likely related
       to insufficient permissions on the data directory, a full disk, or other file system
       problems.

       Use DROP DATABASE to remove a database.

       The program createdb(1) is a wrapper program around this command, provided for
       convenience.

       Database-level configuration parameters (set via ALTER DATABASE) and database-level
       permissions (set via GRANT) are not copied from the template database.

       Although it is possible to copy a database other than template1 by specifying its name as
       the template, this is not (yet) intended as a general-purpose “COPY DATABASE” facility.
       The principal limitation is that no other sessions can be connected to the template
       database while it is being copied.  CREATE DATABASE will fail if any other connection
       exists when it starts; otherwise, new connections to the template database are locked out
       until CREATE DATABASE completes. See Section 22.3 for more information.

       The character set encoding specified for the new database must be compatible with the
       chosen locale settings (LC_COLLATE and LC_CTYPE). If the locale is C (or equivalently
       POSIX), then all encodings are allowed, but for other locale settings there is only one
       encoding that will work properly. (On Windows, however, UTF-8 encoding can be used with
       any locale.)  CREATE DATABASE will allow superusers to specify SQL_ASCII encoding
       regardless of the locale settings, but this choice is deprecated and may result in
       misbehavior of character-string functions if data that is not encoding-compatible with the
       locale is stored in the database.

       The encoding and locale settings must match those of the template database, except when
       template0 is used as template. This is because other databases might contain data that
       does not match the specified encoding, or might contain indexes whose sort ordering is
       affected by LC_COLLATE and LC_CTYPE. Copying such data would result in a database that is
       corrupt according to the new settings.  template0, however, is known to not contain any
       data or indexes that would be affected.

       There is currently no option to use a database locale with nondeterministic comparisons
       (see CREATE COLLATION for an explanation). If this is needed, then per-column collations
       would need to be used.

       The CONNECTION LIMIT option is only enforced approximately; if two new sessions start at
       about the same time when just one connection “slot” remains for the database, it is
       possible that both will fail. Also, the limit is not enforced against superusers or
       background worker processes.

EXAMPLES

       To create a new database:

           CREATE DATABASE lusiadas;

       To create a database sales owned by user salesapp with a default tablespace of salesspace:

           CREATE DATABASE sales OWNER salesapp TABLESPACE salesspace;

       To create a database music with a different locale:

           CREATE DATABASE music
               LOCALE 'sv_SE.utf8'
               TEMPLATE template0;

       In this example, the TEMPLATE template0 clause is required if the specified locale is
       different from the one in template1. (If it is not, then specifying the locale explicitly
       is redundant.)

       To create a database music2 with a different locale and a different character set
       encoding:

           CREATE DATABASE music2
               LOCALE 'sv_SE.iso885915'
               ENCODING LATIN9
               TEMPLATE template0;

       The specified locale and encoding settings must match, or an error will be reported.

       Note that locale names are specific to the operating system, so that the above commands
       might not work in the same way everywhere.

COMPATIBILITY

       There is no CREATE DATABASE statement in the SQL standard. Databases are equivalent to
       catalogs, whose creation is implementation-defined.

SEE ALSO

       ALTER DATABASE (ALTER_DATABASE(7)), DROP DATABASE (DROP_DATABASE(7))