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                MVCC:多版本并發控制 ## 存在的意義 它使得大部分支持行鎖的事務引擎,不再單純的使用行鎖來進行數據庫的并發控制,取而代之的是把數據庫的行鎖與行的多個版本結合起來,只需要很小的開銷,就可以實現非鎖定讀,從而大大提高數據庫系統的并發性能 ## 具體實現 不同存儲引擎的MVCC實現是不同的.下面以innodb為例講解 參考:http://blog.csdn.net/chen77716/article/details/6742128
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