併發控制練習

原創 睡觉对我很重要 2020-05-16 17:28

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引入
（1）多個事務並行結果正確當且僅當與串行執行結果相同，並且可串行的是當且僅當是正確的調度。
（2） 兩階段鎖協議 ： 讀寫之前都會申請封鎖，釋放之後不再申請封鎖。

（3） 同一事務兩種操作以及不同事務衝突操作不能交換
（4） S 封鎖上只能加S封鎖，X封鎖不能加封鎖
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