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A lot of applications have poor connection discipline, keeping connections open even when they are not being used. Setting a high connection limit is cheap insurance against these applications. Until something changes and the applications decide to actively use all of those connections, then the insurance becomes pretty expensive.


"Can support" != "optimal throughput". You can use lots of connections, but it's slower. If you use fewer connections and queue work, you get the same amount of work done in a smaller time. Even more extreme is the discrepancy for another DBaaS provider, who proposes a 2 core server with 500 concurrent connections. How could this possibly work well? ...

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