I recently asked a similar question and got no response. Evidently we are the only two. Our experience with a RAC source and single instance target is not good. Turns out that there is a bug (undocumented negative feature) that prevents RAC sources from being captured at the target. Oracle is working on it... John gparc@xxxxxxx wrote: Hi listers, Platform : Hp-ux 11i / Oracle 10.2.0.2 We are considering using Asynchronous change data capture to track modifications in our DB. Does anyone already use it ? So far, what we can see is : - it needs Oracle JVM in the DB (although it's based on Streams and Logminer) - it doesn't support Lobs columns Any other pitfalls ? And don't tell me ACDC is a "Highway to Hell" :-) Regards Gilles -- http://www.freelists.org/webpage/oracle-l --------------------------------- New Yahoo! Messenger with Voice. Call regular phones from your PC for low, low rates.