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How come a compress enable table (name as ABC) when created (Oracle 11g R1), but after merging with a partitioned table's partition with data which is not compressed, then the table (ABC) auto becoming nonecompress?

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do you mean exchange partition with the table? If not, can you show the code you are executing, including ddl for the tables. – ik_zelf Dec 15 '11 at 9:29

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