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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:
参考: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.BEGINDBMS_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;/