Because the Derby database is optimized for SQL queries, you get optimal performance when accessing the resources index.
由于Derby数据库针对SQL查询做了优化，因此访问资源索引时可获得最佳性能。
Establishment of efficient, fast, optimized search engine index structure will have a decisive impact performance.
建立高效、快速、优化的索引结构会对搜索引擎的性能产生决定性的影响。
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