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Update 数据库系统原理.md

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修改意向锁 IS 和 IX的兼容关系 NO -> YES
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Gaofeng.Qi 2018-05-17 17:24:44 +08:00 committed by GitHub
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@ -161,7 +161,7 @@ MySQL 中提供了两种封锁粒度：行级锁以及表级锁。
|X |NO |NO |NO | NO|
|IX |NO |YES |NO | YES|
|S |NO |NO |YES | YES|
|IS |NO |NO |YES | YES|
|IS |NO |YES |YES | YES|
解释如下：