目录背景Seconds_Behind_Master 可靠吗?根源一:计算方法的局限性变量说明问题点根源二:单线程 SQL 线程的延迟掩盖问题点根源三:并行复制的误报问题点根源四:网络和 I/O 延迟的忽略问题点小结解决方案:pt-heart
I\'ve got a couple of Core Data-gene开发者_如何学运维rated class files that I\'d like to add custom methods to. I don\'t need to add any instance variables. How can I do this?