This subfield indicates the number of bucket fragments that
    Oracle Rdb had to fetch. A bucket is fragmented if it is too
    large to fit on one page. A fragmented bucket requires more
    CPU time and more virtual memory, and often requires additional
    I/O operations because each bucket fragment must be fetched. If
    this value is high compared to the number of buckets fetched,
    Oracle Corporation recommends that you use the RMU Analyze Areas
    command to further analyze the problem to see how many buckets
    are actually fragmented.