The ExternalIterator class encapsulates the behavior required to sequentially access elements of an external collection. An external iterator instance sequentially accesses the virtual instances of the collection, in a forward or a reverse direction.
External iterators provide the operations required to scroll an SQL cursor associated with the result set of the query, which was used to populate the external collection.
For details about the methods defined in the ExternalIterator class, see "ExternalIterator Methods", in the following subsection.
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