As a DBA when managing a MongoDB instance, monitoring database size is crucial for performance optimization and storage planning. This guide will help you to check MongoDB size in GB. Let’s go through this:
Table of Contents
Why Checking the size of MongoDB is Important
Regularly checking the size of MongoDB helps on below:
✅ Monitor Storage Growth – Prevent unexpected storage issues.
✅ Optimize Performance – Reduce query response times.
✅ Improve Backup & Maintenance – Manage disk space efficiently.
Login to Mongo Shell:
mongo
Login to the Desired MongoDB to check database size:
use <database_name>
Check MongoDB database Size in GB :
db.stats(1024*1024*1024)
Output :
You will get some output like below :
Check MongoDB database Size in bytes:
db.stats()
Summarize Collection size :
db.getCollectionNames().forEach(function(collection) {
var stats = db[collection].stats(1024*1024*1024);
print(collection + " - Size: " + stats.size + " GB, Storage: " + stats.storageSize + " GB, Index: " + stats.totalIndexSize + " GB");
});
Hope this helps!! Also, you can get further information from the below official document as well.
Storage Engines for Self-Managed Deployments
Other MongoDB-related Articles: