mongodb non unique index
Creates a unique index so that the collection will not accept insertion or ... a 2d , or a geoHaystack index on a collection that has a non-simple collation, you must ... ,MongoDBs indexes currently do not store a count per index (or collection). It makes no difference whether they are unique or non-unique indexes either. In order ...
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 mongodb non unique index 相關參考資料
Compound Indexes — MongoDB Manual
If you have a collection that has both a compound index and an index on its prefix (e.g. a: 1, b: 1 } and a: 1 } ), if neither index has a sparse or unique constraint ... https://docs.mongodb.com db.collection.createIndex() — MongoDB Manual
Creates a unique index so that the collection will not accept insertion or ... a 2d , or a geoHaystack index on a collection that has a non-simple collation, you must ... https://docs.mongodb.com Does MongoDB store counts for non-unique indexes? - Stack ...
MongoDBs indexes currently do not store a count per index (or collection). It makes no difference whether they are unique or non-unique indexes either. In order ... https://stackoverflow.com How to drop non-unique index only? - Stack Overflow
How to drop non-unique index only? mongodb mongodb-query. I have the following index in my databases (yes, I have a couple of them). https://stackoverflow.com How to efficiently find a non-unique key value documents in ...
2020年6月26日 — I can use db['collection-name'].find('switch':'on'}) query but its not efficient to fetch. Is there anyway to use index on this key 'switch' to retrieve&n... https://stackoverflow.com How to index a non unique key in mongodb? - Stack Overflow
2018年11月16日 — And is it possible to index a non unique key in a schema? Like if I want to create another collection for comments and likes, how to retrieve the ... https://stackoverflow.com Indexes — MongoDB Manual
The unique property for an index causes MongoDB to reject duplicate values for the indexed field. Other than the unique constraint, unique indexes are ... https://docs.mongodb.com Multikey Indexes — MongoDB Manual
Create Multikey Index; Index Bounds; Unique Multikey Index; Limitations ... index key values as long as the index key values for that document do not duplicate ... https://docs.mongodb.com Sparse Indexes — MongoDB Manual
By contrast, non-sparse indexes contain all documents in a collection, storing ... unique prevents collection from having documents with duplicate values for a ... https://docs.mongodb.com Unique Indexes — MongoDB Manual
MongoDB cannot create a unique index on the specified index field(s) if the collection already contains data that would violate the unique constraint for the index. You may not specify a unique constr... https://docs.mongodb.com |