I’ll introduce how to check the Storage Engine in MongoDB.

MongoDB version 3.x

You can check whether the Storage Engine is MMAPv1 or WiredTiger using the db.serverStatus() command.

db.serverStatus().storageEngine
{ "name" : "wiredTiger" }

MongoDB version 2.x and below

Don’t worry.

The Storage Engine is only MMAP and cannot be selected, so there’s no way to check it.

Reference Information

• Storage Engines — MongoDB Manual 3.4
• WiredTiger Storage Engine — MongoDB Manual 3.2

That’s all from the Gemba.