MongoDB intermediate ---- join multi-Table query

Related data is stored together, and targeted queries can eliminate join, which is more efficient and convenient than distributed storage.

Related data is stored together, and targeted queries can eliminate join, which is more efficient and convenient than distributed storage.

MongoDB intermediate ----> join multi-Table query

[Date: 2011-08-19] Source: Linux Author: crazyjixiang [Font:]

DBRef is a more formal specification for creating references between documents. DBRefs (generally) include a collection name as well as an object id. most developers only use DBRefs if the collection can change from one document to the next. if your referenced collection will always be the same, the manual references outlined above are more efficient.

Related data is stored together, and targeted queries can eliminate join, which is more efficient and convenient than distributed storage.

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MongoDB-DBref (associated insertion, query, and deletion) instance depth

MongoDB-level data Insert, Query, and Delete performance tests

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