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【单选题】
为保证数据库的恢复，登记日志文件时必须严格按并行事务操作执行的时间顺序进行登记，而且要遵循（）的规则。A.
先写日志再操作
B.
先操作再写日志
C.
强制写日志
D.
只有更新操作写日志
拍照语音搜题，微信中搜索"皮皮学"使用
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