This illustration shows a materialized view database and a master database. The materialized views in the hr schema use a private database link to connect to the tables in the hr schema at the master database. The database link is shown connecting to the master database in the following way:

CONNECT TO hr
  IDENTIFIED BY ...

The materialized views in the oe schema use a private database link to connect to the tables in the oe schema at the master database. The database link is shown connecting to the master database in the following way:

CONNECT TO oe