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This paper calls for a new breed of lightweight systems - dynamic data management systems (DDMS). In a nutshell, a DDMS manages large dynamic data structures with agile, frequently fresh views, and provides a facility for monitoring these views and triggering application-level events. We motivate DDMS with applications in large-scale data analytics, database monitoring, and high-frequency algorithmic trading. We compare DDMS to more traditional data management systems architectures. We present the DBToaster project, which is an ongoing effort to develop a prototype DDMS system. We describe its architecture design, techniques for high-frequency incremental view maintenance, storage, scaling up by parallelization, and various key challenges to overcome to make DDMS a reality.