[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f95X_cztLX5L6uj0lUG-bwDez7_gwyutnlEslvc6WVeA":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":24,"type":25},[],"2024-01-08 20:45:12",48921897,[8,9,10,11],"数据操作","程序执行结果","程序运行过程","对数据库的更新操作",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},35,"85cd8a08264df5e09e23ab44a58863e1","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9c1e48361b00f3ee2086f4e259ed792b.jpg","数据库原理及应用A（2022-2023第二学期）","work_28048208","第4 5 6章作业",""日志"文件用于保存( )",[21,26,35,44,53,62,72,77,85,94],{"answer":22,"createTime":5,"id":6,"options":23,"question":19,"source":24,"type":25},[],[8,9,10,11],"v1",0,{"answer":27,"createTime":5,"id":28,"options":29,"question":34,"source":24,"type":25},[],48921898,[30,31,32,33],"未提交随后又被撤销的数据","末提交的数据","回退的数据","末回退的数据","在数据库技术中,"脏数据"是指( )",{"answer":36,"createTime":5,"id":37,"options":38,"question":43,"source":24,"type":25},[],48921899,[39,40,41,42],"不该插入的数据被插入","应该删除的数据未被删除","应该插入的数据未被插入","不该删除的数据被删除","关系规范化中的删除操作异常是指( )",{"answer":45,"createTime":5,"id":46,"options":47,"question":52,"source":24,"type":25},[],48921900,[48,49,50,51],"一致性","完整性","安全性","并发控制","视图机制提高了数据库系统的( )",{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":24,"type":25},[],48921901,[57,58,59,60],"存取控制","协商","封锁","恢复","解决并发控制带来的数据不一致问题普遍采用的技术是( )",{"answer":63,"createTime":64,"id":65,"options":66,"question":71,"source":24,"type":25},[],"2024-01-08 20:45:13",48921902,[67,68,69,70],"物理设计","需求分析","概念设计","逻辑设计","在数据库设计中,规划存储结构和存取方法属于( )阶段",{"answer":73,"createTime":64,"id":74,"options":75,"question":76,"source":24,"type":25},[],48921903,[39,42,40,41],"关系规范化中的插入操作异常是指( )",{"answer":78,"createTime":5,"id":79,"options":80,"question":84,"source":24,"type":25},[],48921904,[81,48,82,83],"原子性","持久性","隔离性","一个事务在执行时,应该遵守"要么不做,要么全做"的原则,这是事务的( )",{"answer":86,"createTime":64,"id":87,"options":88,"question":93,"source":24,"type":25},[],48921905,[89,90,91,92],"既可读又可写","只能写不能读","只能读不能些写","不能读也不能写","如事务T对数据对象R实现X封锁,则T对R ( )",{"answer":95,"createTime":5,"id":96,"options":97,"question":102,"source":24,"type":25},[],48921906,[98,99,100,101],"加载数据","系统调试","扩充功能","建立库结构","数据库物理设计完成后,进入数据库实施阶段,下列各项中不属于实施阶段的工作是( )"]