| 摘要: |
| ＩＭＤＢＳ是一个集成式的多数据库系统，该系统是通过对已有的局部异构数据库进行信息和数据的集成，为全局用户提供共享的集成信息；同时每个局部应用仍能在被集成后的数据上运行，这样就保证了局部数据库的自治性．ＩＭＤＢＳ系统主要是基于源标签集成机制，并与非一范式（ＮＦ2）模型相结合作为多源数据模型，多源数据语言为ＰＳＱＬ／ＮＦ，它是一个类ＳＱＬ语言，非常方便于用户的使用．该系统具有自下而上集成关系、网状和层次数据库以及自上而下地进行分布数据管理的功能，较好地解决了异构分布库系统的全局分布透明性 |
| 关键词: 源标签，非一范式数据模型，模式集成，多数据库系统，多源查询处理 |
| DOI： |
| 分类号: |
| 基金项目:本研究得到863高技术的资助. |
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| POLYGEN DATA MODEL,LANGUAGE AND QUERY PROCESSING IN IMDBS SYSTEM |
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Wang Guoren,Yu Ge,Zhang Bin,Shan Jidi,Zheng Huaiyuan
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| Abstract: |
| IMDBS is an integrated multi-databases system which can integrate information and data in existing local heterogeneous database systems and supply global users with shared Integrated Information.And all local database applications can still execute on the Integrated database,thus localautonomymlght be preserved.IMDBSbasedonthe source tag Integration mechanism adopted the non first normal form(NF2)data model as its polygendata mode.PSQL/NF,a SQL like polygendata language,Is defined for users to use it to manipulate database conveniently. The system can Integrate traditionaldatabases such as relational,hlerarchlcal and network databases bottomup and managedistributed data top-down,so it fundamentally resolves the conflict between global dl.tribution transparency and local autonomy in heterogeneous distributed database systems.This paper mainly describesthe polygen data model,the polygen data language and theimplementatlontechnlques ofqueryprocessingofthe IMDBSsystem. |
| Key words: Source tag,NF2 data model,schema integration,multi-database system, query Processing. |
