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皮皮学刷刷变学霸
举一反三
【单选题】下列哪项不是羊水检查的适应证
A.
高危妊娠有引产指征
B.
父母想确定胎儿性别
C.
夫妇双方或一方有染色体异常
D.
既往有不明原因的流产，早产或死胎史
E.
检查胎儿有无官内感染
【多选题】Which two statements are true regarding undo tablespaces? (Choose two.)
A.
An undo tablespace is automatically created if the UNDO TABLESPACE parameter is not set and the UNDO_MANAGEMENT parameter is set to AUTO during the database instance start up
B.
Undo segments automatically grow and shrink as needed. acting as circular storage buffer for their assigned transactions
C.
The UNDO TABLESPACE parameter is valid in both automatic and manual undo management
D.
The database can have more than one undo tablespace
【多选题】Which two statements are true regarding undo tablespaces（）
A.
The database can have more than one undo tablespace.
B.
The UNDO_TABLESPACE parameter is valid in both automatic andmanualundo management.
C.
Undo segments automatically grow and shrink as needed， acting as circular storage buffer for their assigned transactions.
D.
An undotablespaceis automatically created if the UNDO_TABLESPACEparameter is not set and the UNDO_MANAGEMENT parameter is set to AUTO during the database instance start up.
【多选题】Which two statements are true regarding undo tablespaces?(Choose two)
A.
The database can have more than one undo tablespace
B.
The UNDO TABLESPACE parameter is valid in both automatic and manual undo management
C.
Undo segments automatically grow and shrink as needed, acting as circular storage buffer for their assigned transactions
D.
An undo tablespace is automatically created if the UNDO_TABLESPACE parameter is not set and the UNDO_MANAGEMENT parameter is set to AUTO during the database instance start up
【单选题】观察图 14 所示的图像状态,下列说法中错误的是:( )
A.
当前使用的是“编辑－操控变形”命令
B.
单击鼠标左键，可以添加一个图钉
C.
在工具选项条的“模式”下拉列表中选择不同的选项，变形的程度也各不相同
D.
在任何情况下，都会显示此网格
【多选题】数据库运行在高负载下，此刻需要修改undo表空间的大小，需要使用undo助手决定评估undo调整大小，在使用undo助手时下面那两项你需要考虑？（）
A.
闪回保留的时间
B.
数据库中undo表空间的数量
C.
查询运行最长的时间
D.
实例快速闪回区的大小
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