| Summary: | 碩士 === 國立臺灣師範大學 === 資訊工程研究所 === 95 === Living in an age of knowledge and information explosion, the enterprise organizations need to face a changeable environment. More and more decision-making information is needed by the proprietor or manager of the enterprise organizations day by day. Due to the limit of system expandability, the traditional database has become inefficient to deal with such a gradually changeable user demand. Moreover, it will be more complex to integrate the data for decision making that are widely distributed over heterogeneous databases. When efficiency is highly required, if the decision making lacks for efficiency, it will let the enterprise organization lose their competition ability. As a result, Chunghwa Telecom Co., Ltd. (CHT), the leader of telecommunication industry will not be an exception. In recent years, they also continuously devoted themselves to various types of data mining constructions. Previously, the call records of fixed-line network were distributed over 32 business places originally, which happened to approach the time of the equipment replacement, CHT planed to concentrate all those call records to three databases in the north, middle and south sections in Taiwan.
According to “similar research and related literature about data collection” and “the research of the previous system”, this research tries to derive the factors of effects for improving the database. The main purposes are:
1. Propose an efficient and stable method to construct a super large data warehouse, and regard Chunghwa Telecom Co., Ltd. fixed-line network call records as the experiment objects, and actually carry on realization and efficiency experiment.
2. By comparing the efficiency with the previous system, it proves and confirms that it can still keep the efficiency even in a huge data quantity. According to the experiments, we can show that our method can really build an efficient and stable super large data warehouse.
3. Under lots of call records measurement and efficiency test, we expect to provide a useful reference for establishing a super large data warehouse.
The efficiency of our database can be measured by four operations: add, change, delete, and search. This research proposes an economic method to achieve the efficiency goal of data warehouse under limited resources. The system has already been used for the service of the telecommunication fixed network call records in CHT. The experiments indicate that the efficiency of the new system is notably better than the old one, which confirms that this method can really make it. In the mean time, it also overcomes many problems that other organizations can’t solve.
Keywords: Data warehouse, Relational database, Materialized view, Self-maintainability, Maintenance cost, Very large database, VLDB
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