<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[baize11的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/baize11</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; baize11]]></copyright><item><title><![CDATA[CannotAcquireLockException 锁超时]]></title><link>https://blog.youkuaiyun.com/baize11/article/details/120730595</link><guid>https://blog.youkuaiyun.com/baize11/article/details/120730595</guid><author>baize11</author><pubDate>Tue, 12 Oct 2021 19:51:16 +0800</pubDate><description><![CDATA[CannotAcquireLockException 锁超时

表锁和行锁

表锁：在添加数据时把整个表锁住

行锁：在添加数据时只锁添加数据的一行

增加索引把表锁改变为行锁

栏位：username 索引类型： UNIQUE



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