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Hybrid Transactional and Analytical Processing (HTAP) systems suffer from workload interference at the software and hardware level. We examine workload interference for HTAP systems and highlight investigation directions to mitigate the interference.
We use the popular two-copy HTAP architecture. The OLTP and OLAP sides are independent components with their own private copies of the data. The OLTP side is a row-store, whereas the OLAP side is a column-store. The OLTP and OLAP sides are connected by means of an intermediate data structure, delta, that keeps track of the fresh tuples that are generated by the OLTP side, but not yet transferred to the OLAP side. OLTP transactions register their modifications to delta before committing. OLAP queries first propagate fresh tuples from the OLTP side to the OLAP side and then perform query execution over the data at the OLAP side [1]. [...]