单项选择题
A. Update job log when a job completes
B. Spawn and remove job slaves
C. Write/read job info to/from memory cache
D. Query job table
E. Pass job information to job slaves
单项选择题 Whichofthefollowingcalendaringsyntaxexpressionswouldevaluatetothelastdayofeverymonth？（）
单项选择题 Consider the following code snippet： BEGIN DBMS_SCHEDULER.SET_ATTRIBUTE （ name => ，，lne_job1， attribute => ，，job_priority， value => 1）； END； / If this code were executed， which of the following statements would be true？（）
多项选择题 Tosetthehistoryretentionperiodforeitherwindowloggingorjobloggingindividually，whichparametersoftheSET_SCHEDULER_ATTRIBUTEprocedureneedtobeused？（）