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216.Which three elements can a job chain process involve? (Choose three)

A. an event

B. a schedule

C. a program

D. another chain

E. a lightweight job

Answer: BDE

答案解析：

參考：http://docs.oracle.com/cd/E11882_01/server.112/e25494/scheduse.htm#ADMIN12458

Defining Chain Steps

After creating a chain object, you define one or more chain steps. Each step can point to one of the following:

• A Scheduler program object (program)--包含 lightweight job

• Another chain (a nested chain)

• An event schedule, inline event, or file watcher

  
  

  The following PL/SQL block creates a lightweight job. Lightweight jobs must reference a program, and the program type must be 'PLSQL_BLOCK

  ' or 'STORED_PROCEDURE'. In addition, the program must be already enabled when you create the job.
  BEGIN   DBMS_SCHEDULER.CREATE_JOB (    job_name         =>  'my_lightweight_job1',    program_name     =>  'polling_prog_n2',    repeat_interval  =>  'FREQ=SECONDLY;INTERVAL=10',    end_date         =>  '30-APR-09 04.00.00 AM Australia/Sydney',    job_style        => 'LIGHTWEIGHT',    comments         => 'Job that polls device n2 every 10 seconds'); END; /
  
  

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