【单选题】【消耗次数：1】
两个事务T1、T2同时对数据库中的数据读取之后先后进行了写入操作，如果并发控制不当会出现（ ）。
①
“读脏数据”
②
丢失修改
③
不能重复读
④
死锁
参考答案：
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相关题目
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设有两个事务T1、T2，T1对数据A进行了写入操作后，T2读取了T1更新后的A，但随后T1对之前的操作进行了回滚，那么（ ）。
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