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http://pic.dhe.ibm.com/infocenter/db2luw/v9r7/index.jsp?topic=%2Fcom.ibm.db2.luw.admin.sec.doc%2Fdoc%2Fc0011397.html
http://blog.itpub.net/13165828/viewspace-610842
http://blog.csdn.net/wkwanglei/article/details/6827481