mysql 执行计划
SET optimizer_trace = "enabled=on";
sql 语句
select trace FROM information_scheme.optimizer_trace;
SET optimizer_trace=“enable=off”;
执行完会返回一个json说明如何优化
mysql 执行计划
SET optimizer_trace = "enabled=on";
sql 语句
select trace FROM information_scheme.optimizer_trace;
SET optimizer_trace=“enable=off”;
执行完会返回一个json说明如何优化