Services or capabilities described in AWS documentation might vary by Region. To see the differences applicable to the AWS European Sovereign Cloud Region, see the AWS European Sovereign Cloud User Guide.$bsonSize
New from version 8.0.1.
The $bsonSize operator in Amazon DocumentDB returns the size in bytes of a document when encoded as BSON.
Parameters
Example (MongoDB Shell)
The following example demonstrates how to use the $bsonSize operator to return the BSON size of each document.
Create sample documents
db.items.insertMany([
{_id: 1, name: "a", tags: ["x"]},
{_id: 2, name: "ab", tags: ["x", "y", "z"]},
{_id: 3, name: "abc", tags: []}
]);
Query example
db.items.aggregate([
{ $project: { docSize: { $bsonSize: "$$ROOT" } } }
]);
Output
[
{_id: 1, docSize: 46},
{_id: 2, docSize: 65},
{_id: 3, docSize: 39}
]
Exact sizes depend on BSON encoding of the document fields.
Code examples
To view a code example for using the $bsonSize operator, choose the tab for the language that you want to use:
- Node.js
-
const { MongoClient } = require('mongodb');
async function example() {
const client = new MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false');
try {
await client.connect();
const db = client.db('test');
const collection = db.collection('items');
const result = await collection.aggregate([
{ $project: { docSize: { $bsonSize: "$$ROOT" } } }
]).toArray();
console.log(result);
} finally {
await client.close();
}
}
example();
- Python
-
from pymongo import MongoClient
def example():
client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
try:
db = client['test']
collection = db['items']
result = list(collection.aggregate([
{'$project': {'docSize': {'$bsonSize': '$$ROOT'}}}
]))
print(result)
finally:
client.close()
example()