053-443

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.