This field gives the number of index entries inserted into all
    index nodes. This number includes root, leaf, and duplicate
    entries within user- and system-defined indexes.

    This number is greater than the number of records being stored
    in the database because it usually takes one to two insertions
    into an index for each record for each index. The calculation of
    node insertions minus the sum of the root, leaf, and duplicate
    insertions yields the number of entries inserted into mid-level
    nodes. This number and the "root insertions" field indicate
    sorted balancing activity.