通过异构批处理特性，这些跨表更新只需访问数据库一次即可完成。
With heterogeneous batching, these updates across tables can be done in a single trip to the database.
然后，就系统的三个难点问题——异常处理、安全权限控制和异构数据库访问进行了深入的研究。
Then, this paper deeply investigated the three difficult problems of the system, such as exception handling, security right controlling and heterogeneous database access.
将这项技术应用于油田中的地质图绘制方面，解决了油田中多层分布式异构数据库的访问、管理和地质图件的动态生成问题。
This technology solves the problems of access and management of the multi-tier distribution heterogeneous databases for oilfields and dynamic generation of geologic maps.
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