Specifies the number of buffers a process will write
    asynchronously.

    The default is one-fifth of the buffer pool, but not more than 10
    buffers. The minimum value is 2 buffers; the maximum value can be
    as large as the buffer pool.

    You can override the number of buffers to be written
    asynchronously by defining the logical name RDM$BIND_BATCH_MAX.
    For information about how to set the values, see the Oracle Rdb7
    Guide to Database Performance and Tuning.