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。
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。
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