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drop database link abc;
create database link abc
connect to YKT identified by YKT
using '(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = orcl的IP)(PORT = 1521))
(CONNECT_DATA =
(SID = orcl)
))';
-- Create database link
create database link dblink_name
connect to username identified by password
using 'orcl_name';