PARTITION When used with the RESERVING clause specifies a list
    of numeric partition numbers so that only a subset of the tables
    partitions are reserved. For example, an application could submit
    several processing jobs that each reserved a separate partition
    of the table for EXCLUSIVE access. The default, if this clause
    is omitted, is to reserve all partitions. An error is reported if
    the application references a partition if the table that was not
    reserved.