Covering indexes allow data storage within the index itself while sparse indexes exclude documents that do not contain the missing field.
Covered索引允许在索引本身里存储数据,而Sparse索引则会排除掉不包含索引字段的文档。
The index is a combination of three sub-indices covering wealth, health and education.
该指数由3个次指标组成,涵盖了财富,健康和教育领域。
The answer to the question as stated in your subject line in general is no. Because you generally would much prefer to have the narrowest covering (probably non-clustered) index.
这个问题的答案所你的主题一般是否定的。因为你通常可能更倾向于有窄覆盖(可能非集群)指数。
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