If you create an image copy of a compressed table space, the compressed rows can be unloaded from the image copy data set only if the dictionary for decompression has been retrieved and assembled in the correct order.

For PowerExchange to successfully process an image copy data set, the information in the DB2 catalog that describes the table and the table space containing the table must reflect the exact state of the objects at the time when the image copy was created. DB2 allows some ALTER statements to be issued and then later implemented (materialized) by running the REORG utility. Thus, a mismatch can occur between the information in the DB2 catalog and the content of the most recent image copy of a table space. Before you use an image copy as a source for bulk data movement, you must verify that no ALTER statements have been issued against the table or table space since the image copy was created.