CREATE TABLESPACE registers a new cluster-wide tablespace. The
tablespace name must be distinct from the name of any existing
tablespace in the database cluster. A tablespace allows
superusers to define an alternative location on the file system
where the data files containing database objects (such as tables
and indexes) can reside. A user with appropriate privileges can
pass tablespace_name to CREATE DATABASE, CREATE TABLE, CREATE
INDEX or ADD CONSTRAINT to have the data files for these objects
stored within the specified tablespace. The name of a tablespace
to be created. The name cannot begin with pg_, as such names are
reserved for system tablespaces. The name of the user who will
own the tablespace. If omitted, defaults to the user executing
the command. Only superusers can create tablespaces, but they
can assign ownership of tablespaces to non-superusers. The
directory that will be used for the tablespace. The directory
should be empty and must be owned by the PostgreSQL system user.
The directory must