작업시 참고
0=> No Log
1=> Displays the start and end of each session
2=> Displays level 1 and the start and end of each step
3=> Displays level 2 and each task executed
4=> Displays the SQL queries executed, as well as level 3
5=> A complete trace, inclueds level 4
6=> Log level 6 has the same behavior as log level 5, but with the addition of variable tracking while execution or restarting jobs.
ref. http://oditraining.blogspot.com/2012/06/log-levels-in-oracle-data-integrator.html