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Mastering MongoDB 7.0
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In the following section, you will explore different index types, understanding how and when to utilize them for optimal outcomes.
The simplest and the most common type of index is the single-field index. By default, MongoDB automatically generates single-field indexes for every collection—a unique index on the _id
field. This index prevents the insertion of a second document with the same value for the _id
field into the collection.
In the previous section, you saw an example of the simplest possible single-field index. You can further enhance your books
collection by adding a couple more indexes—one for the titles and one for the price, which is an embedded field, to make it unique.
Execute the following command:
db.books.createIndex({ "title": 1 }, { "unique": true })
Note
Two indexes cannot have the same shape even in cases when the options are different. For...