The figure depicts the high-level architecture of Hyrise. With Hyrise² we introduce a chunk-based storage concept. Chunks are horizontal partitions of a certain capacity. When the capacity of a chunk is reached, the storage engine will apply dictionary encoding to reduce the memory footprint. The main motivation behind the chunk concept is increased flexibility for data distribution. We envision chunks as a natural entity for distributing data, e.g., in NUMA and replication scenarios, and for offloading data to GPU accelerators. The chunk concept supports different internal data layouts. At the current stage, we have implemented a column store. By implementing different types of chunks, we will also be able to add support for row stores and hybrid data layouts. Hyrise keeps the complete data set in main memory. Persistent storage is utilized to guarantee durability.