mongodb index example
For example, a value of 1 specifies an index that orders items in ascending order. A value of -1 specifies an index that orders items in descending order. ,You cannot create a compound multikey index if more than one to-be-indexed field of a document is an array. For example, consider a collection that contains ... ,The value of the field in the index specification describes the kind of index for that field. For example, a value of 1 specifies an index that orders items in ... ,For example, create an ascending index on the field a for a collection records : ... For example, an index key pattern a: 1, b: 1 } can support a sort on a: 1, b: 1 } ... ,MongoDB Indexing - Learn MongoDB in simple and easy steps starting from basic to advanced concepts with examples including what is mongoD?, why and ... ,Create an Index. To create an index in the Mongo Shell, use db.collection.createIndex() . The db.collection.createIndex method only creates an index if an index of the same specification does not already exist. To create an index on a collection in MongoD,If you only ever query on a single key in a given collection, then you need to create just one single-key index for that collection. For example, you might create an ... ,For example, the collection myColl has a compound index on the numeric fields score and price and the string field category ; the index is created with the ... ,With a wildcard text index, MongoDB indexes every field that contains string data for each document in the collection. The following example creates a text index ...
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 mongodb index example 相關參考資料
Single Field Indexes — MongoDB Manual
For example, a value of 1 specifies an index that orders items in ascending order. A value of -1 specifies an index that orders items in descending order. https://docs.mongodb.com Multikey Indexes — MongoDB Manual
You cannot create a compound multikey index if more than one to-be-indexed field of a document is an array. For example, consider a collection that contains ... https://docs.mongodb.com Compound Indexes — MongoDB Manual
The value of the field in the index specification describes the kind of index for that field. For example, a value of 1 specifies an index that orders items in ... https://docs.mongodb.com Use Indexes to Sort Query Results — MongoDB Manual
For example, create an ascending index on the field a for a collection records : ... For example, an index key pattern a: 1, b: 1 } can support a sort on a: 1, b: 1 } ... https://docs.mongodb.com MongoDB Indexing - Tutorialspoint
MongoDB Indexing - Learn MongoDB in simple and easy steps starting from basic to advanced concepts with examples including what is mongoD?, why and ... https://www.tutorialspoint.com Indexes — MongoDB Manual
Create an Index. To create an index in the Mongo Shell, use db.collection.createIndex() . The db.collection.createIndex method only creates an index if an index of the same specification does not alre... https://docs.mongodb.com Create Indexes to Support Your Queries — MongoDB Manual
If you only ever query on a single key in a given collection, then you need to create just one single-key index for that collection. For example, you might create an ... https://docs.mongodb.com db.collection.createIndex() — MongoDB Manual
For example, the collection myColl has a compound index on the numeric fields score and price and the string field category ; the index is created with the ... https://docs.mongodb.com Text Indexes — MongoDB Manual
With a wildcard text index, MongoDB indexes every field that contains string data for each document in the collection. The following example creates a text index ... https://docs.mongodb.com |