Row_Count=n

    Specifies the number of rows that are sent in a single I/O
    request when Workload Statistics are collected. You can
    experiment to find the value for n that provides the best
    performance and memory usage for your database and environment.

    As you increase the value of n, you see an increase in
    performance at the expense of additional memory and overhead.

    The minimum value you can specify for n is 1. The default value
    for n is 100.