Oracle Golden Gate has two main architectures since 12.3.0.1:

• Classic
• Microservices

Let's check them one by one. In the Classic Architecture we have the following structure:

So, we have the GoldenGate which runs through a manager using pumps and so on. You know the drill. Now with the new version we have the RESTful implementation:

As you will notice there are some traditional components of Oracle GoldenGate missing, while there are still extracts (capture), trail files, and replicats (apply). This is due to being a completely new replication architecture which had many benefits. A few of these benefits are:

Remote Administration SSL Support HTML 5 webpages for each service/server Additional replication protocols (WSS, WS, UDT, OGG) Real-time Performance Metrics

For more detail you can check here: