DOCSP-41984: single field index

source/includes/indexes/indexes.php

@@ -0,0 +1,32 @@
+<?php
+
+require __DIR__ . '/../vendor/autoload.php';
+
+$uri = getenv('MONGODB_URI') ?: throw new RuntimeException('Set the MONGODB_URI variable to your Atlas URI that connects to the sample dataset');
+$client = new MongoDB\Client($uri);
+
+$database = $client->sample_mflix;
+$collection = $database->movies;
+
+// start-list-indexes
+foreach ($collection->listIndexes() as $indexInfo) {
+    echo $indexInfo;
+}
+// end-list-indexes
+
+// start-remove-index
+$collection->dropIndex('_title_');
+// end-remove-index
+
+// start-remove-all-indexes
+$collection->dropIndexes();
+// end-remove-all-indexes
+
+// start-index-single
+$indexName = $collection->createIndex(['title' => 1]);
+// end-index-single
+
+// start-index-single-query
+$document = $collection->findOne(['title' => 'Sweethearts']);
+echo json_encode($document) , PHP_EOL;
+// end-index-single-query

source/indexes.txt

@@ -18,11 +18,12 @@ Optimize Queries by Using Indexes
    :description: Learn how to use indexes by using the MongoDB PHP Library.
    :keywords: query, optimization, efficiency, usage example, code example
 
-.. .. toctree::
-..    :titlesonly:
-..    :maxdepth: 1
-.. 
-..    /work-with-indexes
+.. toctree::
+   :titlesonly:
+   :maxdepth: 1
+
+   /indexes/index-mgmt
+   /indexes/single-field-index
 
 Overview
 --------

source/indexes/index-mgmt.txt

@@ -0,0 +1,139 @@
+.. _php-index-mgmt:
+
+===================================
+Index Considerations and Management
+===================================
+
+.. contents:: On this page
+   :local:
+   :backlinks: none
+   :depth: 2
+   :class: singlecol
+
+.. facet::
+   :name: genre
+   :values: reference
+
+.. meta::
+   :keywords: query, optimization, efficiency
+
+Overview
+--------
+
+In this guide, you can learn about using **indexes** to improve the
+efficiency of your queries and add functionality to querying and
+storing documents.
+
+Without a relevant index, MongoDB scans every document in a collection
+to find the documents that match a query. These collection scans are
+slow and can negatively affect the performance of your application.
+However, if the appropriate index exists, MongoDB can use the index to
+reduce the number of documents to inspect.
+
+Operational Considerations
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+To improve query performance, build indexes on fields that appear often in
+your application's queries or operations that return sorted results. Each
+index that you add consumes disk space and memory, so we recommend
+that you track memory and disk usage when doing capacity planning. In addition,
+when a write operation updates an indexed field, MongoDB updates the related
+index, which can negatively impact performance for write operations.
+
+You can use :manual:`wildcard indexes </core/index-wildcard/>` in your
+MongoDB application to query against fields whose names are not known in
+advance or are arbitrary. Wildcard indexes are *not* designed to replace
+workload-based index planning.
+
+To learn more about designing your data model and choosing
+indexes, see the :manual:`Indexes
+</core/data-model-operations/#indexes>` section of the Operational
+Factors and Data Models guide in the {+mdb-server+} manual.
+
+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 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 an Index
+---------------
+
+MongoDB supports several index types to help query your data.
+The following pages describe different index types and provide sample
+code to programmatically create each type of index.
+
+- :ref:`php-single-field-index`
+
+.. - :ref:`php-compound-index`
+.. - :ref:`php-atlas-search-index`
+
+List Indexes
+------------
+
+You can retrieve a list of indexes on a collection by calling the
+``MongoDB\Collection::listIndexes()`` method:
+
+.. literalinclude:: /includes/indexes/indexes.php
+   :language: php
+   :start-after: start-list-indexes
+   :end-before: end-list-indexes
+   :dedent:
+
+Remove an Index
+---------------
+
+You can remove any unused index except the default unique index on the
+``_id`` field.
+
+The following sections provide examples that show how to remove one or
+more indexes from a collection.
+
+Delete a Single Index
+~~~~~~~~~~~~~~~~~~~~~
+
+Pass the name of an index to the ``MongoDB\Collection::dropIndex()``
+method to remove an index from a collection.
+
+The following example removes the ``'_title_'`` index from the
+``movies`` collection:
+
+.. literalinclude:: /includes/indexes/indexes.php
+   :language: php
+   :start-after: start-remove-index
+   :end-before: end-remove-index
+   :dedent:
+
+.. note::
+
+   You cannot remove a single field from a compound index. You must
+   drop the entire index and create a new one to update the indexed
+   fields.
+
+Delete All Indexes
+~~~~~~~~~~~~~~~~~~
+
+You can delete all indexes by calling the
+``MongoDB\Collection::dropIndexes()`` method on a collection:
+
+.. literalinclude:: /includes/indexes/indexes.php
+   :language: php
+   :start-after: start-remove-all-indexes
+   :end-before: end-remove-all-indexes
+   :dedent:
+
+The ``dropIndexes()`` method returns information about the number of
+indexes removed and a success message.
+
+API Documentation
+~~~~~~~~~~~~~~~~~
+
+To learn more about any of the methods or types discussed in this
+guide, see the following API documentation:
+
+- `MongoDB\\Collection::listIndexes() <{+api+}/method/MongoDBCollection-listIndexes/>`__
+- `MongoDB\\Collection::dropIndex() <{+api+}/method/MongoDBCollection-dropIndex/>`__
+- `MongoDB\\Collection::dropIndexes() <{+api+}/method/MongoDBCollection-dropIndexes/>`__

source/indexes/single-field-index.txt

@@ -0,0 +1,96 @@
+.. _php-single-field-index:
+
+====================
+Single Field Indexes
+====================
+
+.. contents:: On this page
+   :local:
+   :backlinks: none
+   :depth: 2
+   :class: singlecol
+
+.. facet::
+   :name: genre
+   :values: reference
+
+.. meta::
+   :keywords: index, query, optimization, efficiency
+
+Overview
+--------
+
+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
+amount of time or at a specified clock time.
+
+When creating a single-field index, you must specify the following
+details:
+
+- The field on which to create the index
+- The sort order for the indexed values as either ascending or
+  descending
+
+.. note::
+
+   The default ``_id_`` index is an example of a single-field index.
+   This index is automatically created on the ``_id`` field when a new
+   collection is created.
+
+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 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 Single-Field Index
+-------------------------
+
+Use the ``MongoDB\Collection::createIndex()`` method to create a single
+field index. The following example creates an index in ascending order on the
+``title`` field:
+
+.. literalinclude:: /includes/indexes/indexes.php
+   :start-after: start-index-single
+   :end-before: end-index-single
+   :language: php
+   :copyable:
+   :dedent:
+
+The following is an example of a query that is covered by the index
+created in the preceding code example:
+
+.. io-code-block::
+   :copyable: true
+
+   .. input:: /includes/indexes/indexes.php
+      :start-after: start-index-single-query
+      :end-before: end-index-single-query
+      :language: php
+      :dedent:
+
+   .. output::
+      :visible: false
+
+      {"_id":...,"plot":"A musical comedy duo...",
+      "genres":["Musical"],...,"title":"Sweethearts",...}
+
+Additional Information
+----------------------
+
+To learn more about single-field indexes, see :manual:`Single Field
+Indexes </core/index-single>` in the {+mdb-server+} manual.
+
+API Documentation
+~~~~~~~~~~~~~~~~~
+
+To learn more about any of the methods discussed in this guide, see the following API
+documentation:
+
+- `MongoDB\\Collection::createIndex() <{+api+}/method/MongoDBCollection-createIndex/>`__
+- `MongoDB\\Collection::findOne() <{+api+}/method/MongoDBCollection-findOne/>`__