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Tools to Help to Improve SQL in Rails

Rails优化SQL可能用到的工具

Have you ever encountered a Rails app that is slow in rendering pages? Are you trying to find out what's causing it to be "slow"? Where is the performance bottleneck? Is it the slow execution of SQL queries (maybe N+1, or not having the right indexes), or is it something else, like the view being too big? Performance optimization has...