创建dblink

-- Create database link
create public database link DB_GSCM
  connect to app_gscm identified by  gscm
  using '(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 10.88.144.238)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SID = SCMORATEST)
      (SERVER = DEDICATED)
    )
  )';