Oracle创建数据库databaselink

create  database link showcase

connect to showcase

identified by showcase 

using '

  (DESCRIPTION =

    (ADDRESS_LIST =

      (ADDRESS = (PROTOCOL = TCP)(HOST = 10.135.1.121)(PORT = 1521))

    )

    (CONNECT_DATA =

      (SERVICE_NAME = OMSTEST)

    )

  )

';