I attended a session today at Oracle Open World 2015 by Markus Michalewicz which highlighted some new features we can look forward to for Oracle Grid Infrastructure 12.2, currently in beta. There were lots of new features, but a few stood out as major changes to the architecture.
Oracle 12.1 introduced Flex Clusters about two years ago. With Flex Clusters, you can have Hub Nodes and Leaf Nodes, the primary difference being that Leaf Nodes do not need access to the shared storage of the cluster. When this was announced, many people assumed you could run an Oracle RAC instance on a Leaf Node, but this was not the case. Not until Oracle 12.2 anyway. With 12.2, you can now run an Oracle RAC instance on a Leaf Node. There is one catch though. Since the Leaf Node does not have access to shared storage, there is no access to Online Redo Logs which means the instances on the Leaf Nodes are read-only to the data. This is a great way to offload reporting activities similar to the way people have been leveraging Active Data Guard. I haven’t seen this in action, but my initial thoughts would be that the DBA needs to weigh the performance carefully. Surely offloading reporting capabilities has its merits but it comes at the cost of additional latency when an instance on a Leaf Node needs to contact an instance on a Hub Node and transfer the blocks via Cache Fusion. After all, the Leaf Node has no direct access to disk so it must need to get the data block via a Hub Node.
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While watching the presentation, it didn’t seem like these were major announcements. It almost sounded low-key. But I think that as we get to play with the 12.2 version, we’ll get a better handle of how much Oracle GI/RAC features just got a lot more expansive, which some might read as more complicated.
