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Indexes
=======
Indexes are defined through `ensureIndex` every time a model is compiled for a
certain connection / database. This means that indexes will only be ensured
once during the lifetime of your app.
## Definition
Regular indexes:
var User = new Schema({
name: { type: String, index: true }
})
[Sparse](http://www.mongodb.org/display/DOCS/Indexes#Indexes-SparseIndexes) indexes:
var User = new Schema({
name: { type: String, sparse: true }
})
Unique indexes:
var User = new Schema({
name: { type: String, unique: true }
})
// or
var User = new Schema({
name: { type: String, index: { unique: true } }
})
Unique sparse indexes:
var User = new Schema({
name: { type: String, unique: true, sparse: true }
})
Compound indexes are defined on the `Schema` itself.
User.index({ first: 1, last: -1 }, { unique: true })
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