You can divide the data storage between the source systems and the target system to reduce the need for massive amounts of disk space on the target system. This is accomplished by using a data pump on each source, rather than sending data directly from each Extract across the network to the target.

• A primary Extract writes to a local trail on each source.

• A data-pump Extract on each source reads the local trail and sends it across TCP/IP to a dedicated Replicat group.