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| mongo_management [2020/12/16 09:37] – andonovj | mongo_management [2020/12/16 09:42] (current) – [Index] andonovj |
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| ====Index==== | ====Index==== |
| Indexes help with searching through mongo, as such there are a lot of indexes, depending what you need: | Indexes support the efficient execution of queries in MongoDB. Without indexes, MongoDB must perform a collection scan, i.e. scan every document in a collection, to select those documents that match the query statement. If an appropriate index exists for a query, MongoDB can use the index to limit the number of documents it must inspect. |
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| | Indexes are special data structures [1] that store a small portion of the collection’s data set in an easy to traverse form. The index stores the value of a specific field or set of fields, ordered by the value of the field. The ordering of the index entries supports efficient equality matches and range-based query operations. In addition, MongoDB can return sorted results by using the ordering in the index. |
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| | The following diagram illustrates a query that selects and orders the matching documents using an index: |
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| | {{:mongoindexoverview.jpg?600|}} |
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| ===Index types=== | ===Index types=== |