CREATE DATABASE — create a new database
CREATE DATABASEname[ WITH ] [ OWNER [=]user_name] [ TEMPLATE [=]template] [ ENCODING [=]encoding] [ STRATEGY [=]strategy] [ LOCALE [=]locale] [ LC_COLLATE [=]lc_collate] [ LC_CTYPE [=]lc_ctype] [ ICU_LOCALE [=]icu_locale] [ LOCALE_PROVIDER [=]locale_provider] [ COLLATION_VERSION =collation_version] [ TABLESPACE [=]tablespace_name] [ ALLOW_CONNECTIONS [=]allowconn] [ CONNECTION LIMIT [=]connlimit] [ IS_TEMPLATE [=]istemplate] [ OID [=]oid]
   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.
  
   By default, the new database will be created by cloning the standard
   system database template1.  A different template can be
   specified by writing TEMPLATE
   .  In particular,
   by writing nameTEMPLATE 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.
  
nameThe 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 a direct or indirect member of that role,
        or be a superuser.
       
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 24.3.1. 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
        This is a shortcut for setting LC_COLLATE
        and LC_CTYPE at once.
       
         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
        Collation order (LC_COLLATE) to use in the new database.
        This 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.
        The default is to use the collation order of the template database.
        See below for additional restrictions.
       
lc_ctype
        Character classification (LC_CTYPE) to use in the new
        database. This affects the categorization of characters, e.g., lower,
        upper and digit. The default is to use the character classification of
        the template database. See below for additional restrictions.
       
icu_localeSpecifies the ICU locale ID if the ICU locale provider is used.
locale_provider
        Specifies the provider to use for the default collation in this
        database.  Possible values are:
        icu,
        libc.  libc is the default.  The
        available choices depend on the operating system and build options.
       
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 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
        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).
        
connlimitHow 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.
        
oidThe 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.
    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 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 23.3 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.
  
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.
   There is no CREATE DATABASE statement in the SQL
   standard.  Databases are equivalent to catalogs, whose creation is
   implementation-defined.