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ODBMSs are used in advanced database applications to manage complex objects and objects that have methods. Some of the applications also require temporal and historical information management in the context of such object management. We develop a temporal persistent object management system, named POST/C++. POST/C++ is based on a temporal persistent object model that treats past states of persistent objects as objects. In current implementation, the performance to access historical objects is slower than to access current objects. In this paper, we discuss the improvement of POST/C++, and we propose the efficiently schemes to access historical objects.