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Multi-key Indexing on an entire array with MongoDB?
<p>Let us first create a collection with documents −</p><pre class="prettyprint notranslate">> db.demo277.insertOne({"details":[{"FirstName":"John"}]}); { "acknowledged" : true, "insertedId" : ObjectId("5e48fb21dd099650a5401a52") } > db.demo277.insertOne({"details":[{"FirstName":"David"}]}); { "acknowledged" : true, "insertedId" : ObjectId("5e48fb27dd099650a5401a53") } > db.demo277.insertOne({"details":[{"FirstName":"Chris"}]}); { "acknowledged" : true, "insertedId" : ObjectId("5e48fb2bdd099650a5401a54") }</pre><p>Display all documents from a collection with the help of find() method −</p><pre class="prettyprint notranslate">> db.demo277.find();</pre><p>This will produce the following output −</p><pre class="result notranslate">{ "_id" : ObjectId("5e48fb21dd099650a5401a52"), "details" : [ { "FirstName" : "John" } ] } { "_id" : ObjectId("5e48fb27dd099650a5401a53"), "details" : [ { "FirstName" : "David" } ] } { "_id" : ObjectId("5e48fb2bdd099650a5401a54"), "details" : [ { "FirstName" : "Chris" } ] }</pre><p>Following is the query to implement multi-key indexing on an entire array. It does scan full documents −</p><pre class="prettyprint notranslate">> db.demo277.find({"details":{FirstName:"David"}});</pre><p>This will produce the following output −</p><pre class="result notranslate">{ "_id" : ObjectId("5e48fb27dd099650a5401a53"), "details" : [ { "FirstName" : "David" } ] }</pre>
Updated on 31-Mar-2020 13:16:35
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