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In MongoDB will limit() increase query speed?
No, using LIMIT() decreases the bandwidth consumption and it does not increase query speed. Let us see an example and create a collection with documents −
> db.demo197.insertOne({"Name":"Chris"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3afde803d395bdc21346d8")
}
> db.demo197.insertOne({"Name":"Bob"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3afdef03d395bdc21346d9")
}
> db.demo197.insertOne({"Name":"David"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3afdf203d395bdc21346da")
}
> db.demo197.insertOne({"Name":"Sam"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3afdf603d395bdc21346db")
}
> db.demo197.insertOne({"Name":"Mike"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3afdf903d395bdc21346dc")
}
> db.demo197.insertOne({"Name":"Carol"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3afe1603d395bdc21346dd")
}
> db.demo197.insertOne({"Name":"John"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3afe2003d395bdc21346de")
}
Display all documents from a collection with the help of find() method −
> db.demo197.find();
This will produce the following output −
{ "_id" : ObjectId("5e3afde803d395bdc21346d8"), "Name" : "Chris" }
{ "_id" : ObjectId("5e3afdef03d395bdc21346d9"), "Name" : "Bob" }
{ "_id" : ObjectId("5e3afdf203d395bdc21346da"), "Name" : "David" }
{ "_id" : ObjectId("5e3afdf603d395bdc21346db"), "Name" : "Sam" }
{ "_id" : ObjectId("5e3afdf903d395bdc21346dc"), "Name" : "Mike" }
{ "_id" : ObjectId("5e3afe1603d395bdc21346dd"), "Name" : "Carol" }
{ "_id" : ObjectId("5e3afe2003d395bdc21346de"), "Name" : "John" }
Following is the query using LIMIT() −
> db.demo197.find().limit(4);
This will produce the following output −
{ "_id" : ObjectId("5e3afde803d395bdc21346d8"), "Name" : "Chris" }
{ "_id" : ObjectId("5e3afdef03d395bdc21346d9"), "Name" : "Bob" }
{ "_id" : ObjectId("5e3afdf203d395bdc21346da"), "Name" : "David" }
{ "_id" : ObjectId("5e3afdf603d395bdc21346db"), "Name" : "Sam" }
Updated on: 2020-03-27T10:04:51+05:30
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