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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 })