645.Which two statements are true about a job chain? (Choose two.)
A. A job chain can contain a nested chain of jobs.
B. The jobs in a job chain cannot have more than one dependency.
C. A job of the CHAIN type can be run using event-based or time-based schedules.
D. The jobs in a job chain can be executed only by using the events generated by the Scheduler
Answer: AC
参考：http://docs.oracle.com/cd/E11882_01/appdev.112/e40758/d_sched.htm#ARPLS72960
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)
Another chain (a nested chain)
An event schedule, inline event, or file watcher
You define a step that points to a program or nested chain by using the DEFINE_CHAIN_STEP procedure. An example is the following, which adds two steps tomy_chain1:
BEGIN
DBMS_SCHEDULER.DEFINE_CHAIN_STEP (chain_name => 'my_chain1',step_name => 'my_step1',program_name => 'my_program1');
DBMS_SCHEDULER.DEFINE_CHAIN_STEP (chain_name => 'my_chain1',step_name => 'my_step2',program_name => 'my_chain2');
END;
/
A. A job chain can contain a nested chain of jobs.
B. The jobs in a job chain cannot have more than one dependency.
C. A job of the CHAIN type can be run using event-based or time-based schedules.
D. The jobs in a job chain can be executed only by using the events generated by the Scheduler
Answer: AC
参考：http://docs.oracle.com/cd/E11882_01/appdev.112/e40758/d_sched.htm#ARPLS72960
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)
Another chain (a nested chain)
An event schedule, inline event, or file watcher
You define a step that points to a program or nested chain by using the DEFINE_CHAIN_STEP procedure. An example is the following, which adds two steps tomy_chain1:
BEGIN
DBMS_SCHEDULER.DEFINE_CHAIN_STEP (chain_name => 'my_chain1',step_name => 'my_step1',program_name => 'my_program1');
DBMS_SCHEDULER.DEFINE_CHAIN_STEP (chain_name => 'my_chain1',step_name => 'my_step2',program_name => 'my_chain2');
END;
/
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/81227/viewspace-2120301/ ，如需转载，请注明出处，否则将追究法律责任。
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