Data transformation strategy study of independent data mart on dimensional model;

Study on the techniques of data transformation based on dimensional model in independent data mart;

Study and implementation of data independence based on DB2/400 database;

In order to solve the limit, this paper studies the process algbra and CSP model at first, and then extends the CSP model based on data independence.

And by using the mapping between stratifications,the data independence is realized.

Because that is based on the common data mode for designing the system and is used multistage image technology, the database systemm possess the perfact data independence.