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- 单项选择题Users in your PROD database complain about the slow response of the transactions. While investigating the reason， you find that the transactions are waiting for the undo segments to be available， and undo retention has been set to zero. What would you do to overcome this problem？（）
A、increase the undo retention
B、create more undo segments
C、create another undo tablespace
D、increase the size of the undo tablespace
- D
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