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。

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The client does not have to spend time and human resources in either buying the index or trying to replicate it.

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The index combines five measures: available resources, access to water, people's capacity to afford and organise water supplies, use of water for domestic, industrial and environmental purposes, and environmental management.

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Resources and financials make up the bulk of the Composite Index so without strong advances in those sectors, overall gains will be restrained.

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