> I assume that CTAS would be more performant for IOT Right, on the other side for (heap) tables or partitioned tables there is a great difference in performance between CTAS over INSERT APPEND but only in case when the target table has indexes (but INSERT APPEND to a table with indexes is better than INSERT without APPEND) From your description I assume that your target tables have no indexes. In this case I didn't observed significant difference in behavior between CTAS (nologging parallel) and INSERT APPEND (with parallel dml enabled) on tables and range partitioned tables. HTH Jaromir D.B. Nemec http://www.db-nemec.com ----- Original Message ----- From: "Alexander Gorbachev" <gorbyx@xxxxxxxxx> To: "ORACLE-L" <oracle-l@xxxxxxxxxxxxx> Sent: Saturday, December 11, 2004 4:41 PM Subject: INSERT versus CTAS -- //www.freelists.org/webpage/oracle-l