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多项选择题Using a bitmap structure to manage database object space has several benefits over using freelist structures. Which three are benefits of managing space using automatic-segment-space managed objects？（）

A、It readily responds to dynamic changes for concurrent access. 

B、It improves performance and space utilization in a multiple-instance environment. 

C、It requires fewer space related options then freelist managed structures. 

D、It improves performance for SYSTEM tablespaces where a high degree of concurrency is required.

  • A,C,D

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