Distributed database system may be regarded as a series of union of centralized database system.

分布式数据库系统可以看作是一系列集中式数据库系统的联合。

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The distributed database system has its own characters and theory, though it was based on the centralized database system.

分布式数据库系统虽然基于集中式数据库系统，但却有一定的特色和理论基础。

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Although some technique and ways to query in centralized database system can also be used in distributed one, there are basic differences between them in terms of scale and factors of databases.

尽管在分布式处理中也使用某些集中式查询处理中的技术和方法，但就其问题的规模和优化的因素，都与集中式查询处理有质的不同。

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In place of a centralized database, many countries want a federated system where the identifiers are developed by a country or region.

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Ritchie also has the world's biggest database of equipment price and availability, comprising a centralized appraisal system with more than a million pieces from every manufacturer.

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