Web repository utilizes materialized views to integrate information,so the most important task for it is torefresh the views periodically to keep its vitality. The goal of view refreshing is to obtain the maximal system fresh-ness, however, most of traditional standards do not consider query effect so that the corresponding view-refreshingscheme is usually inefficient. In this paper,we first bring forward a more reasonable standard for system freshness,thereafter make a comprehensive discussion upon system refreshing frequency,system resource allocation and view-re-freshing order. After analyzing the effect and function to system freshness for each factor,we give a general strategyfor materialized view refreshing.
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