You want to be notified when the space usage of an existing critical tablespace has reached 75% of the allocated space. Which option would you use to achieve this?()
A. run a procedure to check the tablespace space usage
B. define the warning threshold for the tablespace at 75% in Database Control
C. create a trigger to be executed when tablespace space usage reaches 75%
D. submit a job by using DBMS_JOB package to check the free space in the tablespace at regular intervals
E. define the warning threshold to be 75% for the tablespace by ALTER TABLESPAC. ADD THRESHOLD command
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A. 五
B. 十
C. 十五
微体的主要功能是()
A. 参与细胞的分泌活动
B. 细胞内的消化器官
C. 消除对细胞有害的H2O2
D. 对有害物质进行解毒
501-599页区涉及什么方面的内容?
A. 部件拆装
B. 测试调节
C. 排故