ALTER TABLESPACE changes the definition of a tablespace.
You must own the tablespace to use ALTER TABLESPACE . To alter the owner, you must also be a direct or indirect member of the new owning role. (Note that superusers have these privileges automatically.)
The name of an existing tablespace.
The new name of the tablespace. The new name cannot begin with pg_ , as such names are reserved for system tablespaces.
The new owner of the tablespace.
Rename tablespace index_space to fast_raid :
ALTER TABLESPACE index_space RENAME TO fast_raid;
Change the owner of tablespace index_space :
ALTER TABLESPACE index_space OWNER TO mary;