【单选题】【消耗次数：1】
报警号一般包括下列几方面的故障（ ）
①
程序编制错误或操作错误
②
存储器工作不正常
③
伺服系统故障
④
可编程序控制故障
⑤
连接故障
⑥
以上选项都选
参考答案：
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相关题目
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数据库的故障是指从保护安全的角度出发，数据库系统中会发生的各种故障。这些故障主要包括：（ ）、系统故障、介质故障和计算机病毒与黑客
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丢失修改故障
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反向扫描日志，找出在故障发生前已经提交的事务将其加入REDO-LIST，同时找出故障发生时尚未完成的事务将其加入UNDO-LIST
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对UNDO-LIST中的各个事务执行撤销处理
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对REDO-LIST中的各个事务执行重做处理
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正向扫描日志，找出在故障发生前已经提交的事务将其加入REDO-LIST，同时找出故障发生时尚未完成的事务将其加入UNDO-LIST
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