After the introducing the knowledge of distributed data warehouse and pre- aggregated data, the deficiency of on-line maintenance and off-line maintenance are analyzed; the application range of dynamic incremental maintenance algorithm is extended, and the model and algorithm of dynamic incremental maintenance in distributed data warehouse is proposed.

IM-FPM:incremental maintenance algorithm for frequent pattern mining;

Method of incremental maintenance of materialized views with aggregation

In order to reduce the overhead of the network communication for maintaining the consistency between XML materialized views and their data source,a web-based incremental maintenance solution for XML materialized views is provided.

In light of the current situation of Tianjin Port,it is recommended to adopt the construction technique of navigable depth dynamic maintenance for prolonging the maintenance cycle,reducing the maintenance cost,and solving the contradiction between port production and dredging.

The authors describe the issue of object clustering in situation awareness and point out that object clustering is just a dynamic process consisting of increasing creation and dynamic maintenance of clusters.

The new concept of static maintenance and dynamic maintenance for the knowledge base are proposed and explained with the base of rules as an example.

Furthermore, the cable s shock factor and dynamic increment were calculated.