Defines vertical partitioning, horizontal partitioning, or both
    for the specified table.

    Horizontal partitioning means that you divide the rows of the
    table among storage areas according to data values in one or more
    columns. Vertical partitioning means that you divide the columns
    of the table among storage areas. A given storage area will then
    contain only some of the columns of a table. You can combine both
    horizontal and vertical partitions in a single map.

    Vertical partitioning reduces disk I/O operations by placing
    frequently used data in one area, so that you can read and update
    those portions of the table in a single disk I/O operation.

    See the Oracle Rdb Guide to Database Design and Definition for
    more information regarding partitioning.