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单选题
Very soon you will be performing maintenance operations. You would have several jobs to run as soon as the maintenance period starts. Which method would you use to create jobs without specifying the time period when the job should be run？（）
A
use DBMS_IJOB package
B
use Oracle Scheduler
C
use DBMS_JOB package
D
use Oracle Data Pump Export and Import
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use DBMS_IJOB packageB
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