exp/imp and defragmentation on busy database

I've read quite a bit of documentation and discussion on using exp/imp to change the initial extent of a table. But I've found no mention of what pre-exp or post-imp steps are necessary to "lock" the table during the defragmentation process. Seems that without such a step, there could be loss of data. For example, changes made to the table between the export and the dropping of the table.

Any pointers appreciated,
Brian Gastineau
bgastine_at_giveblood.org

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