Replication Option is a software product that lets you
    distribute whole databases, or parts of them, to target
    directories on the same or different nodes in a network. The
    source database for extraction and extraction rollup target
    databases can be a DSRI-compliant database such as Oracle Rdb or
    one of the Oracle data access products, known as gateways.

    Note that RDO does not support all the latest Replication Option
    features. Oracle recommends that you use the SQL interface instead
    of RDO because SQL is an industry-standard database access language
    and only SQL supports all the latest Replication Option features.