| 1. | 3 . updating the materialized views and auxiliary relations
利用更新值对每个辅助视图和物化视图进行更新。 |
| 2. | 2dcma : an effective maintenance algorithm of materialized views in peer data management systems
Peer数据管理系统中的一个高效物化视图维护算法2dcma |
| 3. | 16 gupta a , jagadish h v , mumick i s . data integration using self - maintainable views . in proc . the 5th int
条件c是一个物化视图能够在一条语义链路上能够从一个peer传递到另一个peer 。 |
| 4. | A data warehouse stores materialized view over data from one or more sources in order to fast access to integrated data
为了对一个或多个数据源聚集数据快速查询，我们通常在数据仓库中保存物化视图。 |
| 5. | Otherwise , if a view is not selected , all the cells in this view will not be materialized . this strategy results in the unstable query performance
这样的物化方式所产生的一个后果就是物化视图中的数据与非物化视图中数据在查询性能上差别很大。 |
| 6. | First , the definition of view is extended and the peer view , local view and global view are proposed according to the requirements of applications
在pdms中连接操作限制在各个局部pdms中，这样全局物化视图的维护就转化为对各相关局部物化视图的维护。 |
| 7. | There are two main factors to influence materialized views in pdmss . one is that schema mappings between peers are changed , and the other is that peers update their data
在pdms中有两个主要因素影响物化视图：第一是peer之间的模式映射发生了改变，第二是有peer更新了它的数据。 |
| 8. | Extending database technology : advances in database technology , avignon , france , 1996 , pp . 140 - 144 . 17 ceri s , widom j . deriving production rules for incremental view maintenance . in proc
动作a包括两种情况：第一，物化视图的语义和数据量增加了第二，物化视图的语义和数据量减少了。 |
| 9. | In this paper , we use directed - acyclic graph ( dag ) to represent a query processing , then define a cost model and a query efficiency model , and finally put forward an algorithm for materialized views selection
在考虑空间约束的基础上，提出一种物化视图选择方法，并给出了切实可行的算法步骤。 |
| 10. | In this thesis , first 1 research on the self - maintainability of simple views that only use one operation . then i propose an efficient self - maintainable algorithm based on analysis of binary express of views . the algorithm includes three steps : 1
本文在介绍自维护算法之前，先讨论了基本视图的自维护性，然后用二叉表示树对物化视图的结构进行了分析，在此基础上，给出了视图自维护的算法： 1 |
