mysql二阶段提交

二阶段提交是为了保证 redo log 和 binlog 的逻辑一致性。当进行 crash recovery 时，如果 redo log 已经 commit，那就毫不犹豫地将事务提交。如果 redo log 处于 prepare 状态，则需要判断事务对应的 binlog 是否完整。如果完整，则提交事务。否则，事务回滚。这样可以确保 redo log 和 binlog 的数据是一致的。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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