impdp (via DBMS_DATAPUMP) with INCLUDE_METADATA = 0 generates x times more redo log than a complete

Hi,

I'm currently trying to figure out why copying a schema using DBMS_DATAPUMP without INCLUDE_METADATA generates about 4,3 GB of redo while doing a data-only copy (INCLUDE_METADATA = 0) generates about 17,8 GB of redo.

In both cases the data is copied via database link from a different server.

I've already used log miner to see what's the main difference, but I've no clue what the figures are all about. The only thing I notice is the extremely high number of "INTERNAL" operations when doing a data-only copy.

Complete copy:

Operation	Count	Sum(length(sql_redo))	average
COMMIT	40.033	280.231	7
DDL	8.828	5.406.588	612
DELETE	26.637	6.335.452	238
INSERT