$currentOp

The $currentOp aggregation stage returns information about currently running operations in the database. This stage is useful for monitoring active queries and operations in an aggregation pipeline.

Parameters

• allUsers (optional): When set to true, returns operations for all users. Default is false.

• idleConnections (optional): When set to true, includes idle connections. Default is false.

• idleCursors (optional): When set to true, includes information about idle cursors. Default is false.

• idleSessions (optional): When set to true, includes information about idle sessions. Default is true.

• localOps (optional): When set to true, includes local operations. Default is false.

Example (MongoDB Shell)

The following example demonstrates using the $currentOp aggregation stage to retrieve information about active read operations.

Query example

db.aggregate([
  { $currentOp: { allUsers: true, idleConnections: false } },
  { $match: { op: "query" } }
])

Output

[
  {
    "opid": "12345",
    "active": true,
    "op": "query",
    "ns": "test.users",
    "secs_running": 2
  }
]

Code examples

To view a code example for using the $currentOp command, choose the tab for the language that you want to use:

Node.js

const { MongoClient } = require('mongodb');

async function example() {
  const client = await MongoClient.connect('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false');
  const db = client.db('admin');

  const result = await db.aggregate([
    { $currentOp: { allUsers: true, idleConnections: false } },
    { $match: { op: "query" } }
  ]).toArray();

  console.log(result);
  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')
    db = client['admin']

    result = list(db.aggregate([
        { '$currentOp': { 'allUsers': True, 'idleConnections': False } },
        { '$match': { 'op': 'query' } }
    ]))

    print(result)
    client.close()

example()