This paper presents an integration scheme of heterogeneous data sources based on ontology, which fundamentally solves the grammatical and semantic heterogeneity of data sources within enterprises; at the same time, it also provides a set of effective technical measures for timely and accurate sharing of information within enterprises. Keywords: heterogeneous data sources; integration; ontology With the continuous expansion of enterprise scale and the advancement of enterprise informatization construction, a large amount of data stored in different ways has accumulated within the enterprise. These data are scattered in various management subsystems, and the information is relatively closed and the degree of sharing is low. In today\'s world where \"information is efficiency\", enterprise leaders often need to query multiple business systems and external systems based on various heterogeneous data sources to make a decision, and make a decision only after a large amount of data analysis. The workload is large and human errors are prone to occur, thus affecting the quality of decision-making. Therefore, information sharing within the enterprise and the integration and integration of information systems have become urgent problems for enterprises. To solve these problems, the fundamental way is to reduce or even eliminate the confusion in concepts and terms, reach a common understanding of things that is consistent with each other, and use it as a unified framework and foundation between various different viewpoints. Therefore, this paper proposes an ontology-based information system integration method to solve the grammatical and semantic heterogeneity of internal enterprise data sources.
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