I ntroducon to MemSQL An ODS receives transacons from an OLTP system in a minimally intrusive manner using techniques such as extract transform and load(ETL) or change data capture. It also serves as a source for the data warehouse. Tradionally, an ODS would serve as an up-to-date replica of operaonal data for a variety of analyc requirements. However, over the years, more data sources have driven a massive increase in data volume and velocity creang a series of challenges for legacy ODS technologies to keep up. Figure 1. Legacy mul-ered ODS architecture 4