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Network monitoring is an increasingly important task in the operation of today’s large and complex computer networks. In recent years, technologies leveraging software defined networking and programmable hardware have been proposed. These innovations enable operators to get fine-grained insight into every single packet traversing their network at high rates. They generate packet or flow records of all or a subset of traffic in the network and send them to an analytics system that runs specific applications to detect performance or security issues at line rate in a live manner. Unexplored, however, remains the area of detailed, inter- active, and retrospective analysis of network records for debugging or auditing purposes. This is likely due to technical challenges in storing and querying large amounts of network monitoring data efficiently. In this work, we study these challenges in more detail. In particular, we explore recent advances in time series databases and find that these systems not only scale to millions of records per second but also allow for expressive queries significantly simplifying practical network debugging and data analysis in the context of computer network monitoring.