Then, this paper deeply investigated the three difficult problems of the system, such as exception handling, security right controlling and heterogeneous database access.

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。

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Encapsulated with ODBC and OCI, the UDB CLI can not only interconnect the heterogeneous database but also improve the performance of the system.

封装了ODBC和OCI的通用数据库接口，可以实现异构数据库的互连，同时可以提高系统的性能。

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The powerful data operation functions are necessary for a heterogeneous database interoperation system.

强大的数据操作功能是异构数据库互操作系统所必不可少的。

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