Replication Server 15.5 extends support for heterogeneous databases.
Parallel DSI Support in a Heterogeneous Environment
You can configure Replication Server to apply transactions to the replicate data server in a heterogeneous environment using parallel Data Server Interface (DSI) threads. Applying transactions in parallel increases the speed of replication, yet maintains the serial order of the transactions as they are applied at the primary site.
Trigger Control at the Oracle Replicate Database
You can control trigger firing at the session level or connection level each time a PL/SQL command is executed against an Oracle 10g or 11g replicate database. Controlling trigger execution at the replicate database eliminates duplication and inaccuracy that were caused in earlier versions due to the absence of trigger control at the replicate database.