I'm looking for Oracle and Ingres replication tools based on the use of transaction/redo log "sniffing" - the use of trigger-based replication is too expensive in terms of performance for the requirement I have.

The requirement is to populate a data warehouse continuously from a number of legacy systems which can just about run the normal on-line day production load.

Has anyone any recommendations for any 3rd party tools or applications that do this.

Many thanks.