DOCSP-45204 Compound Index

source/includes/indexes/compound.rb

@@ -0,0 +1,40 @@
+require 'mongo'
+
+# Replace the placeholders with your credentials
+uri = "<connection string>"
+
+# Sets the server_api field of the options object to Stable API version 1
+options = { server_api: { version: "1" }}
+
+# Creates a new client and connect to the server
+client = Mongo::Client.new(uri, options)
+
+# start-sample-data
+database = client.use('sample_mflix')
+collection = database[:movies]
+# end-sample-data
+
+# Creates an index on the "runtime" and "year" field
+# start-index-compound
+collection.indexes.create_one({ runtime: -1, year: 1 })
+# end-index-compound
+
+# Finds a document with the specified runtime and release year by using the newly created index
+# start-index-compound-query
+filter = { '$and' => [
+    { runtime: { '$gt' => 90 } },
+    { year: { '$gt' => 2005 } }
+  ] }
+doc = collection.find(filter).first
+
+if doc
+  puts doc.to_json
+else
+  puts "No document found"
+end
+# end-index-compound-query
+
+# Lists all indexes on the collection
+# start-check-compound-index
+puts collection.indexes.collect(&:to_json)
+# end-check-compound-index

source/indexes.txt

@@ -23,7 +23,7 @@ Optimize Queries by Using Indexes
    :maxdepth: 1
 
    Single Field </indexes/single-field-index>
-..   Compound </indexes/compound-index>
+   Compound </indexes/compound-index>
 ..   Multikey </indexes/multikey-index>
 ..   Atlas Search </indexes/atlas-search-index>
 

source/indexes/compound-index.txt

@@ -0,0 +1,123 @@
+.. _ruby-compound-index:
+
+================
+Compound Indexes
+================
+
+.. contents:: On this page
+   :local:
+   :backlinks: none
+   :depth: 2
+   :class: singlecol
+
+.. facet::
+   :name: genre
+   :values: reference
+
+.. meta::
+   :keywords: index, query, optimization, efficiency
+
+Overview
+--------
+
+**Compound indexes** hold references to multiple
+fields within a collection's documents, improving query and sort
+performance. 
+
+When creating a compound index, you must specify the following details:
+
+- The fields on which to create the index
+
+- The sort order for each field (ascending or descending)
+
+Sample Data
+~~~~~~~~~~~
+
+The examples in this guide use the ``movies`` collection in the
+``sample_mflix`` database from the :atlas:`Atlas sample datasets
+</sample-data>`. To access this collection from your {+language+} 
+application, create a ``Mongo::Client`` object that connects to
+an Atlas cluster and assign the following values to your ``database`` 
+and ``collection``
+variables: 
+
+.. literalinclude:: /includes/indexes/single-field.rb
+   :start-after: start-sample-data
+   :end-before: end-sample-data
+   :language: ruby
+   :copyable:
+
+To learn how to create a free MongoDB Atlas cluster and
+load the sample datasets, see the :atlas:`Get Started with Atlas
+</getting-started>` guide.
+
+Create a Compound Index
+-----------------------
+
+Use the ``create_one`` method to create a compound index. The following 
+example creates an index in descending order on the ``runtime`` field and 
+in ascending order on the ``year`` field:
+
+.. literalinclude:: /includes/indexes/compound.rb
+   :start-after: start-index-compound
+   :end-before: end-index-compound
+   :language: ruby
+   :copyable: 
+
+Verify Index Creation
+---------------------
+
+You can verify that the index was created by listing the indexes in the 
+collection. You should see an index for ``runtime`` and ``year`` in the list, 
+as shown in the following output:
+
+.. io-code-block::
+   :copyable: true
+
+   .. input:: /includes/indexes/compound.rb
+      :start-after: start-check-compound-index
+      :end-before: end-check-compound-index
+      :language: ruby
+
+   .. output::
+      :visible: true
+
+      {"v": 2, "key": {"runtime": -1, "year": 1}, "name": "runtime_-1_year_1"}
+
+Example Query
+-------------
+
+The following is an example of a query that is covered by the index
+created on the ``runtime`` and ``year`` fields:
+
+.. io-code-block::
+   :copyable: true
+
+   .. input:: /includes/indexes/compound.rb
+      :start-after: start-index-compound-query
+      :end-before: end-index-compound-query
+      :language: ruby
+
+   .. output::
+      :visible: false
+
+      {"_id":...,"runtime": 91,...,"title": "Monster House",...,"year": 2006,...}
+
+Additional Information
+----------------------
+
+To view runnable examples that demonstrate how to manage indexes, see
+:ref:`ruby-indexes`.
+
+To learn more about compound indexes, see :manual:`Compound
+Indexes </core/index-compound>` in the {+mdb-server+} manual.
+
+API Documentation
+~~~~~~~~~~~~~~~~~
+
+To learn more about any of the methods discussed in this guide, see the
+following API documentation:
+
+- `indexes <{+api-root+}/Mongo/Collection.html#indexes-instance_method>`__
+- `create_one <{+api-root+}/Mongo/Index/View.html#create_one-instance_method>`__
+- `find <{+api-root+}/Mongo/Collection.html#find-instance_method>`__ 

source/indexes/single-field-index.txt

@@ -20,7 +20,7 @@ Single Field Indexes
 Overview
 --------
 
-Single field indexes are indexes with a reference to a single field of a
+**Single field indexes** are indexes with a reference to a single field of a
 document in a collection. These indexes improve single field query and
 sort performance. They also support :manual:`TTL Indexes </core/index-ttl>`
 that automatically remove documents from a collection after a certain