（单选题）
You receive the following error： ORA-19804： cannot reclaim nnnnn bytes disk space from mmmmm limit Identify the reason for receiving the above error message？（）
A The sort area is very small.
B There is no more space in the Undo tablespace.
C The flash recovery area is full.
D The online redo log file is full.
正确答案
答案解析
略
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