--<https://www.postgresql.org/docs/18/sql-createtablespace.html>
--create tablespace
CREATE TABLESPACE tablespace_name
    [ OWNER { new_owner | CURRENT_ROLE | CURRENT_USER | SESSION_USER } ]
    LOCATION 'directory'
    [ WITH ( tablespace_option = value [, ... ] ) ]

示例： To create a tablespace db3_space at file system location /data/pg/db3_space, first create the directory using operating system facilities and set the correct ownership:

mkdir -p /data/pg/db3_space
chown postgres:postgres /data/pg/db3_space

Then issue the tablespace creation command inside PostgreSQL:

postgres=# create tablespace db3_space location '/data/pg/db3_space';
CREATE TABLESPACE
postgres=# \\db
            List of tablespaces
    Name    |  Owner   |      Location      
------------+----------+--------------------
 db3_space  | postgres | /data/pg/db3_space
 pg_default | postgres | 
 pg_global  | postgres | 
(3 rows)

postgres=#

To create a tablespace owned by a different database user, use a command like this:

CREATE TABLESPACE indexspace OWNER genevieve LOCATION '/data/indexes';

--<https://www.postgresql.org/docs/18/sql-altertablespace.html>
--alter tablesapce
ALTER TABLESPACE name RENAME TO new_name
ALTER TABLESPACE name OWNER TO { new_owner | CURRENT_ROLE | CURRENT_USER | SESSION_USER }
ALTER TABLESPACE name SET ( tablespace_option = value [, ... ] )
ALTER TABLESPACE name RESET ( tablespace_option [, ... ] )

--<https://www.postgresql.org/docs/18/sql-droptablespace.html>
--drop tablespace
DROP TABLESPACE [ IF EXISTS ] name