Tablespaces for RDS for PostgreSQL

RDS for PostgreSQL supports tablespaces for compatibility. Because all storage is on a single logical volume, you can't use tablespaces for I/O splitting or isolation. Our benchmarks and experience indicate that a single logical volume is the best setup for most use cases.

To create and use tablespaces with your RDS for PostgreSQL DB instance requires the rds_superuser role. Your RDS for PostgreSQL DB instance's main user account (default name, postgres) is a member of this role. For more information, see Understanding PostgreSQL roles and permissions.

If you specify a file name when you create a tablespace, the path prefix is /rdsdbdata/db/base/tablespace. The following example places tablespace files in /rdsdbdata/db/base/tablespace/data. This example assumes that a dbadmin user (role) exists and that it's been granted the rds_superuser role needed to work with tablespaces.

postgres=> CREATE TABLESPACE act_data
  OWNER dbadmin
  LOCATION '/data';
CREATE TABLESPACE

To learn more about PostgreSQL tablespaces, see Tablespaces in the PostgreSQL documentation.