【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.
【单选题】UNDO 数据的自动管理方式下( )。
A.
将使用 SYSTEM 表空间的撤销段存储还原数据。
D.
无需 UNDO 表空间,全部由 Oracle 自动管理。
【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:( )
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
【判断题】桥梁是保证车辆行驶宣泄水流及船只同行的构筑物。
【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?()
【单选题】()时期的园林中已经有了成组的风景,既有土山又有池沼或台。