Just One Pure Coder
随着业务越来越复杂，数据量越来越大，并发量越来越大，数据库的性能越来越低。好不容易找运维申请了两台机器，让DBA部署了几个实例，想把一些业务库拆分出来，却发现拆不出来，扩不了容，尴尬！ 因为数据库强关联在一起，无法通过增加数据库实例扩容，就是一个耦合的典型案例。
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