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Limit the number of documents in a collection in MongoDB?
To limit the number of documents in a collection, set capped − true. Set the size there itself. Let us create a collection with documents −
> db.createCollection( "demo683", { capped: true, size: 5 ,max:4} ) { "ok" : 1 } > db.demo683.insertOne({Value:100}); { "acknowledged" : true, "insertedId" : ObjectId("5ea468afa7e81adc6a0b394e") } > db.demo683.insertOne({Value:500}); { "acknowledged" : true, "insertedId" : ObjectId("5ea468b0a7e81adc6a0b394f") } > db.demo683.insertOne({Value:1000}); { "acknowledged" : true, "insertedId" : ObjectId("5ea468b1a7e81adc6a0b3950") } > db.demo683.insertOne({Value:400}); { "acknowledged" : true, "insertedId" : ObjectId("5ea468b2a7e81adc6a0b3951") } > db.demo683.insertOne({Value:800}); { "acknowledged" : true, "insertedId" : ObjectId("5ea468b3a7e81adc6a0b3952") } > db.demo683.insertOne({Value:700}); { "acknowledged" : true, "insertedId" : ObjectId("5ea468b4a7e81adc6a0b3953") }
Display all documents from a collection with the help of find() method −
> db.demo683.find();
This will produce the following output −
{ "_id" : ObjectId("5ea468b1a7e81adc6a0b3950"), "Value" : 1000 } { "_id" : ObjectId("5ea468b2a7e81adc6a0b3951"), "Value" : 400 } { "_id" : ObjectId("5ea468b3a7e81adc6a0b3952"), "Value" : 800 } { "_id" : ObjectId("5ea468b4a7e81adc6a0b3953"), "Value" : 700 }
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