视图自维护方法通过在数据仓库中复制所有或部分源关系的数据，从而使维护数据仓库实化视图时不需要访问数据源。

The latter is one way to maintain the materialized view at the DW without access to the base relations by replicating all or parts of the base data at the DW.

youdao

视图自维护方法通过在数据仓库中复制所有或部分源关系的数据，从而使维护数据仓库实化视图时不需要访问数据源。

The latter is one way to maintain the materialized view at the DW without access to the base relations by replicating all or parts of the base data at the DW.

youdao