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Dynamic means that the join criteria is not applied until the query is actually run.
A keyed logical file with Select/Omit is not a dynamic selection because the selection (& omission) of records is done at the time that the logical file is created. The keyed select/omit logical file only contains entries for those rows meeting the select/omit criteria, so no additional selection is applied during the execution of the query or the open of the LF operation. ==================================
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