参数说明： max-active: 20 是经过压测的底线值——某模拟项目X 在 16 核服务器上，当并发用户达 800 时，若 max-active 设为 10，平均响应时间从 120ms 暴涨至 2.3s；设为 20 后稳定在 140ms 内。 test-on-borrow: false 是血泪经验：开启后每借连接都执行 SELECT 1 ，在高并发下反而成为 DB 新瓶颈。

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Mysql 8 server now supported with default settings. #1021, #906, #991 MAJOR: LOCAL INFILE does not automatically read #1034 from the local fs and now requires an explicit infileStreamFactory to be ...