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Why is MongoDB taking too much time to find the record?
In this case, use the concept of index on a particular field. Let us first create a collection with documents. Here, we have created index as well using createIndex() −
> db.decreasetimeusingindex.createIndex({"StudentName":1});
{
"createdCollectionAutomatically" : true,
"numIndexesBefore" : 1,
"numIndexesAfter" : 2,
"ok" : 1
}
> db.decreasetimeusingindex.insertOne({"StudentName":"John Smith","StudentAge":21});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e03960af5e889d7a51994ff")
}
> db.decreasetimeusingindex.insertOne({"StudentName":"John Doe","StudentAge":24});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e039611f5e889d7a5199500")
}
> db.decreasetimeusingindex.insertOne({"StudentName":"Adam Smith","StudentAge":22});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e03961df5e889d7a5199501")
}Following is the query to display all documents from a collection with the help of find() method −
> db.decreasetimeusingindex.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5e03960af5e889d7a51994ff"),
"StudentName" : "John Smith",
"StudentAge" : 21
}
{
"_id" : ObjectId("5e039611f5e889d7a5199500"),
"StudentName" : "John Doe",
"StudentAge" : 24
}
{
"_id" : ObjectId("5e03961df5e889d7a5199501"),
"StudentName" : "Adam Smith",
"StudentAge" : 22
}Following is the query to find a specific record −
> db.decreasetimeusingindex.find({"StudentName":"Adam Smith"});This will produce the following output −
{ "_id" : ObjectId("5e03961df5e889d7a5199501"), "StudentName" : "Adam Smith", "StudentAge" : 22 }
Updated on: 27-Mar-2020
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