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. You must be a superuser to change the owner of a 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;