undo tablespace meaning in Chinese

撤销表空间

Create an undo tablespace with an appropriate amount of free space
创建具有适当可用空间量的undo表空间。
In oracle 9i , oracle introduced the undo tablespace concept , which replaces the rollback segment
在oracle 9i中， oracle引入了undo表空间概念，这取代了回滚段。
The undo _ retention parameter works best if the current undo tablespace has enough space for the active transactions
Retention能做好地工作如果- - - -当前的回滚表空间对活动事务有足够的空间。
Be sure to allocate enough space in the undo tablespace to satisfy the space requirement for the current setting of this parameter
请确保回滚段中分配了足够的空间以满足该参数当前设置的空间需要。
If an active transaction needs undo space and the undo tablespace does not have any free space , then the system will start reusing undo space that would have been retained
如果一个活动事务需要撤销空间而回滚表空间没有空闲空间，系统会重用本该被保留的撤销空间。