What is the difference between apache derby vs mysql [closed]

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What is the difference between apache derby vs mysql. If there is no much difference in functionality/performance, which is/willbe most popularly used?

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Derby is Java based, while MySQL is C/C++. For more details, check out Wikipedia's comparison

MySQL has been around for a lot longer than Derby. MySQL has more deployments than Derby. In terms of performance, that's dependent on what you are doing. I've seen a few benchmarks showing Derby to be faster in some aspects, but for the most part, MySQL is faster.