MongoDB

Monitor and optimize your MongoDB databases

Overview

DB24x7 provides comprehensive monitoring for MongoDB databases, including query performance analysis, operation profiling, replica set monitoring, sharded cluster insights, and real-time metrics tracking.

Supported Versions

MongoDB 4.4+, 5.0+, 6.0+, 7.0+

Real-time Monitoring

Profiler-based insights

Query Analysis

Slow operation detection

Cloud Support

MongoDB Atlas, AWS DocumentDB

Prerequisites

MongoDB 4.4 or higher installed
Replica set configuration (recommended for production)
Network access from DB24x7 collector
User account with monitoring privileges

Enable Database Profiler

The MongoDB profiler is recommended for detailed query performance tracking. Configure it to capture slow operations.

Profile Slow Operations (Recommended)

// Profile operations slower than 100ms
db.setProfilingLevel(1, { slowms: 100 });

// Verify profiler status
db.getProfilingStatus();

Profile All Operations (Development Only)

// Profile all operations (high overhead)
db.setProfilingLevel(2);

Set Profiler for Specific Database

// Switch to target database
use your_database;

// Enable profiling
db.setProfilingLevel(1, { slowms: 100, sampleRate: 1.0 });

Note

Profiling level 2 (all operations) has significant performance overhead. Use level 1 in production environments.

Create Monitoring User

Create a dedicated user with minimal required roles for monitoring.

Create Monitoring User

// Connect to admin database
use admin;

// Create monitoring user
db.createUser({
  user: "db24x7_monitor",
  pwd: "your_secure_password",
  roles: [
    { role: "clusterMonitor", db: "admin" },
    { role: "read", db: "admin" },
    { role: "read", db: "local" },
    { role: "read", db: "config" }
  ]
});

Grant Database-Specific Read Access

// For each database you want to monitor
use your_database;

db.grantRolesToUser("db24x7_monitor", [
  { role: "read", db: "your_database" }
]);

Verify User Permissions

use admin;

// Check user roles
db.getUser("db24x7_monitor");

// Test authentication
db.auth("db24x7_monitor", "your_secure_password");

Built-in Monitoring Roles

clusterMonitor provides read-only access to monitoring tools and all databases. This is the minimum required role.

Connection URI Format

Use the following connection URI format to connect DB24x7 to your MongoDB database:

Standalone MongoDB

mongodb://db24x7_monitor:your_secure_password@hostname:27017/admin?authSource=admin

Replica Set

mongodb://db24x7_monitor:password@host1:27017,host2:27017,host3:27017/admin?replicaSet=myReplicaSet&authSource=admin

MongoDB Atlas

mongodb+srv://db24x7_monitor:[email protected]/admin?retryWrites=true&w=majority

With SSL/TLS

mongodb://db24x7_monitor:password@hostname:27017/admin?ssl=true&authSource=admin

Connection Parameters

authSource	Database containing user credentials (usually admin)
replicaSet	Name of the replica set
ssl	Enable SSL/TLS encryption (true/false)
retryWrites	Enable retryable writes (recommended)

MongoDB-Specific Features

Operation Profiling

Slow query detection
Operation execution stats
Index usage analysis

Replica Set Monitoring

Replication lag tracking
Member health status
Election and failover detection

Sharded Cluster Insights

Shard distribution analysis
Balancer activity tracking
Chunk migration monitoring

Performance Metrics

WiredTiger cache utilization
Connection pool monitoring
Document operation rates

Troubleshooting

Authentication Failed

Common authentication issues:

•Ensure authSource parameter is set correctly (usually admin)
•Verify user exists in the correct database
•Check password is URL-encoded if it contains special characters
•Confirm authentication mechanism matches server configuration

Connection Timeout

Verify network connectivity:

// Test connection using mongo shell
mongosh "mongodb://db24x7_monitor:password@hostname:27017/admin"

// Check if MongoDB is listening
netstat -an | grep 27017

// Verify firewall allows port 27017
telnet hostname 27017

Insufficient Privileges

Verify user roles:

use admin;

// Check user roles
db.getUser("db24x7_monitor");

// Test server status access
db.serverStatus();

// Test replica set status (if applicable)
rs.status();

Replica Set Connection Issues

Common replica set problems:

•Ensure replicaSet parameter matches the actual replica set name
•Include all replica set members in connection string
•Check DNS resolution for all member hostnames
•Verify network connectivity to all members

Next Steps

Once your MongoDB database is connected, you can:

Analyze Queries

Learn how to analyze slow queries and optimize performance

Set Up Alerts

Configure alerts for critical database metrics