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MongoDB's storage engine is an important component responsible for how MongoDB stores data in memory and disk. MongoDB supports multiple storage engines, because using different storage engines in different application scenarios can make MongoDB perform better.

Starting with MongoDB3.2, MongoDB uses the WiredTiger storage engine by default. It is suitable for high-load applications and is the official preferred recommended storage engine. The WiredTgier storage engine provides a document-level concurrency model, checkpoint functionality and compression capabilities. MongoDB Enterprise Edition also supports encryption.

Prior to MongoDB3.2, MMAPv1 was the default storage engine, and MongoDB Enterprise Edition also supports a memory storage engine that stores documents in memory.

1.WiredTiger storage engine

Starting with MongoDB3.0, the 64-bit version of MongoDB supports the WiredTiger storage engine. The storage engine can be specified on the command line or in the configuration file, and MongoDB3.2 uses the WiredTiger storage engine by default.

-- storageEngine=wiredTiger

YMAL format profile

Storage.engine=wiredTiger

Document-level concurrency

WiredTiger uses document-level concurrency to control write operations. Therefore, multiple clients can modify different documents of the same collection at the same time.

Reference documentation:

Https://docs.mongodb.com/manual/storage/

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