使用模式树和物化视图进行XML查询

Efficient XML Query with Patten Tree and Materialized View

使用模式树解析XQuery查询,将经常被查询的XML节点信息存储到物化视图中。利用物化视图和用户查询的交叉部分,直接从物化视图中获取用户的查询内容。对于两者不完全匹配的部分,使用补充规则,使得能部分使用物化视图,以提高查询效率。文章还给出了模式树的匹配算法。

This paper uses query trees to represent the XQuery, and maintains the query trees for those who were frequently queried and build into the MV(materialized view). For each XQuery, it will match its query tree with the MVs query tree to get the matched part and unmatched part, it gets data from the MV for the matched part, and data from the source XML database for the unmatched part. By this way, it can improve the efficiency of query XML.