Row_Count=n

    Specifies that Oracle Rdb buffer multiple rows between the Oracle
    Rdb server and the RMU Unload process. The default value for n
    is 500 rows; however, this value should be adjusted based on
    working set size and length of unloaded data. Increasing the row
    count may reduce the CPU cost of the unload operation. For remote
    databases, this may significantly reduce network traffic for
    large volumes of data because the buffered data can be packaged
    into larger network packets.

    The minimum value you can specify for n is 1. The default row
    size is the value specified for the Commit_Every qualifier or
    500, whichever is smaller.