单选题
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？（）
发布日期：2022-07-12
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 TABLESPACE .. ADD THRESHOLD command
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