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？（）A run a procedure to check the tablespace space usageB define the warning threshold for
题目
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？（）
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