DROP PUBLIC DATABASE LINK NM_HN;
CREATE PUBLIC DATABASE LINK NM_HN
CONNECT TO XZXT
IDENTIFIED BY <PWD>
USING ‘(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP) (HOST=10.184.17.3) (PORT=1521) )(CONNECT_DATA=(SERVICE_NAME=XZXT1)))‘;
原文：http://www.cnblogs.com/learningJAVA/p/5663500.html