从系统查询效率（Query Efficiency）和查询效果（Query Effectiveness）两个方面入手，研究检索算法、TOP-K检索技术、结果展现、系统架构等重要问题，取得了丰硕研究...
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一些数据集成系统为了提高查询处理的效率，采用数据复制方法。
To improve the efficiency of query processing, data replication method is used in some data integration systems.
实验结果表明，该方案具有较高的首次查询命中率和稳定的过滤效率，能提高加密系统的整体性能。
Experimental result shows that this scheme has higher first inquiry shooting and stable filtering efficiency, it can improve the encryption system performance.
如果不重视查询语句的效率问题，会导致开发出来的应用系统效率低下，资源浪费严重。
If we do not attach importance to the efficiency of the query will lead to the development of the application systems by inefficiency and serious waste of resources.
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