http://www.oracle.com/global/kr/magazine/archive/27spring/Technical_Inside_OCP.pdf
http://www.oracle.com/technology/global/kr/pub/articles/10gdba/week10_10gdba.html
http://www.oracle.com/technology/global/kr/pub/articles/10gdba/week20_10gdba.html
http://www.oracle.com/technology/global/kr/pub/articles/10gdba/nanda_10gr2dba_part2.html
http://www.oracle.com/technology/global/kr/pub/articles/project_lockdown/phase2.html
http://www.oracle.com/technology/global/kr/pub/columns/lemme_oracle9i.html#2
http://www.oracle.com/global/kr/magazine/archive/26summer/Technology_Developer_4.pdf
http://www.oracle.com/global/kr/magazine/archive/25autumn/technology_developer01.pdf