PolarDB is Alibaba Cloud’s flagship database product. Since its birth 5 years ago, it explores new hardware and new architecture extensively, such as Intel Optane Memory, SmartSSD and RDMA high speed network etc. Recently, on top of compute-storage disaggregation, we proposed an additional disaggregated memory layer. It acts as an efficient communication hub for our multi-master solution, and also provides additional memory for complex queries. This talk will introduce PolarDB’s overall architecture and how it benefits from its multi-level disaggregated architecture.