Quick_Sort_Limit=integer

    Specifies the maximum number of records that will be sorted with
    the in-memory "quick sort" algorithm.

    The default value is 5000 records. The minimum value that can be
    specified is 10 and the maximum value is 100,000.

    Larger values specified for the /Quick_Sort_Limit qualifier may
    reduce sort work file IO at the expense of additional CPU time
    and/or memory consumption. A value that is too small may result
    in additional disk file IO. In general, the default value should
    be accepted.