Answer / infa_geek

Integration Service follows instructions coded into Update
Strategy and Custom transformations within the session
mapping to determine how to flag rows for insert, delete,
update, or reject.
If the mapping for the session contains an Update Strategy
transformation, this field is marked Data Driven by
default.
If you do not choose Data Driven when a mapping contains an
Update Strategy or Custom transformation, the Workflow
Manager displays a warning.

Answer / srinu

data driven is a set of rules.based upon this rules the
integration service perfoms all operations in update
strategy transformation.
DD_INSERT
DD_UPDATE
DD_REJECT
DD_DELETE

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