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<img width="340" height="240" align="left" src="https://github.com/brettwooldridge/HikariCP/wiki/welcome-to-the-jungle.jpg">
Microbenchmarks are great at measuring performance "in the small"; for example, measuring the performance of individual methods. But good results do not necessarily translate into macro-scale performance. Real world access patterns and demand loads often run into deeper, systemic, architectural design issues that cannot be discerned at the micro level.
HikariCP has over 100K users, so from time to time we are approached with challenges encountered "in the wild". Recently, one such challenge led to a deeper investigation: ***Spike Demand***.
HikariCP has over 1 million users, so from time to time we are approached with challenges encountered "in the wild". Recently, one such challenge led to a deeper investigation: ***Spike Demand***.
### The Challenge
The user has an environment where connection creation is expensive, on the order of 150ms; and yet queries typically execute in ~2ms. Long connection setup times can be the result of various factors, alone or in combination: DNS resolution times, encrypted connections with strong encryption (2048/4096 bit), external authentication, database server load, etc.

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