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Подскажите, куда копать.
ALL_SCHEDULER_JOB_LOG
DBA_SCHEDULER_JOB_LOG

1. select user from dual скажет EDO?
2.
ДокаPurging Logs
To prevent job and window logs from growing indiscriminately, use the SET_SCHEDULER_ATTRIBUTE procedure to specify how much history (in days) to keep. Once per day, the Scheduler automatically purges all log entries that are older than the specified history period from both the job log and the window log. The default history period is 30 days. For example, to change the history period to 90 days, issue the following statement:

DBMS_SCHEDULER.SET_SCHEDULER_ATTRIBUTE('log_history','90');
Some job classes are more important than others. Because of this, you can override this global history setting by using a class-specific setting. For example, suppose that there are three job classes (class1, class2, and class3), and that you want to keep 10 days of history for the window log, class1, and class3, but 30 days for class2. To achieve this, issue the following statements:

DBMS_SCHEDULER.SET_SCHEDULER_ATTRIBUTE('log_history','10');
DBMS_SCHEDULER.SET_ATTRIBUTE('class2','log_history','30');
You can also set the class-specific history when creating the job class.

И да, еще есть LOGGING_LEVEL