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Which DBMS_SCHEDULER procedure(s) can be used to alter an existing job? (Choose all that apply.)
A. SET_ATTRIBUTE_NULL
B. ALTER_JOB
C. ALTER_JOB_PARAMETERS
D. ALTER
E. SET_ATTRIBUTE

　　A job can be altered only by changing the value of one or more of its attributes.This is accomplished by using the SET_ATTRIBUTE and SET_ATTRIBUTE_NULL procedures.

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原文：http://www.cnblogs.com/Babylon/p/7833323.html