在多种情况下，MySQL主从节点之间可能存在延迟。比如，主库的写入能力强于从库的写入能力、从库单线程复制、从库复制出错导致相关进程停止。为了保证数据的时效性，OneProxy提供了复制时效性检查，用于自动剔除延迟节点。
OneProxy提供两种时效性检查方式
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