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如何给线上数据库添加字段或者添加索引等操作？

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Release： 2016-06-06 20:47:04
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线上数据库约百万条记录，添加字段或者添加索引会导致长时间LOCKED，怎么办？

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线上数据库约百万条记录，添加字段或者添加索引会导致长时间LOCKED，怎么办？

可以考虑用percona toolkit里面的online-schema-change， 这个工具可以用一个相当长但是没有锁的时间来完成这个工作

当然，这个操作是相当危险的，一定要在线上操作之前做足够的测试和模拟，尤其是每一个chunk之间的sleep时间之类的，设定的不太好，也是一个对线上影响非常大的东西

具体文档参考 http://www.percona.com/doc/percona-toolkit/2.2/pt-online-schema-change.html

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