Page_Buffers=number-buffers

    Specifies the maximum number of buffers Oracle Rdb uses during
    the RMU Restore operation while the database files are being
    created. The value of the Page_Buffers qualifier can range from
    1 to 5. The default is 3 buffers. Values larger than 3 might
    improve performance, especially during incremental restore
    operations.

    When RMU Restore enters the stage of reconstructing internal
    structures at the end of the restore operation, a high value
    for the Page_Buffers qualifier can be useful for very large
    databases. However, the cost of using these extra buffers is
    that memory use is high. Thus, the trade-off during a restore
    operation is memory use against performance.