26 дек. 2019 г. · Sparse indexes are like regular indexes in mongodb. The differece is that sparse indexes only include documents that have the indexed field.

5 мая 2017 г. · Sparse index is an optimized index which only contains pointers to documents that have value(s) in the indexed fields.

15 июн. 2013 г. · I have created a sparse and unique index on my mongodb collection. var Account = new Schema({ email: { type: String, index: {unique: true, sparse: true} }, ....

6 июн. 2017 г. · A MongoDB index with the sparse option only contains entries for documents that have the indexed field. MongoDB has flexible schema so fields ...

28 янв. 2015 г. · Because mongodb will index sparse, compound indexes that contain 1 or more of the indexed fields, it is causing my unique, sparse index to fail ...

9 нояб. 2015 г. · I need a compound unique index that will not allow to insert two objects with the same _type and model combination unless specified.

2 янв. 2018 г. · I have created a collection with 100 documents (fields x & y ), and created a normal index on field x and a sparse index on field y , as shown below.

9 апр. 2024 г. · MongoDB provides the option to create partial indexes. Partial indexes offer a superset of the functionality of sparse indexes. Partial Indexes should be ...

22 дек. 2011 г. · Sparse indexes do not contain documents that miss indexed field. However, if field exists and has value of null , it will still be indexed.

18 мар. 2015 г. · Yes it will be added to the index. It would be kind of useless if it wasn't. In the future you can test this yourself by doing ...