What is a storage engine in MongoDB?

A storage engine is the part of a database that is used to manage how data is stored on disk.

For example: one storage engine might offer better performance for read-heavy workloads, and another might support a higher-throughput for write operations.

In MongoDB, a storage engine is a crucial component responsible for managing the storage of data on disk. MongoDB supports pluggable storage engines, which means you can choose the storage engine that best suits your application’s requirements. Each storage engine has its own set of characteristics and performance attributes.

As of my last knowledge update in January 2022, MongoDB has used the WiredTiger storage engine as the default storage engine since version 3.2. WiredTiger is known for its support for compression, document-level concurrency control, and scalability.

It’s important to note that MongoDB’s landscape may have evolved since then, and new storage engines or changes to existing ones may have been introduced. Therefore, it’s advisable to check the official MongoDB documentation or other reliable sources for the most up-to-date information on MongoDB’s storage engines.