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Starting from version 3.0, mongodb support pluggable storage engine. How to know which storage engine is being used in a system?
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WiredTiger is the default storage engine starting in MongoDB 3.2. It is well-suited for most workloads and is recommended for new deployments. WiredTiger provides a document-level concurrency model, checkpointing, and compression, among other features. In MongoDB Enterprise, WiredTiger also supports Encryption at Rest.
WiredTiger uses document-level concurrency control for write operations. As a result, multiple clients can modify different documents of a collection at the same time. For most read and write operations, WiredTiger uses optimistic concurrency control.
Explanation: MongoDB includes support for two storage engines: MMAPv1, the storage engine available in previous versions of MongoDB, and WiredTiger. 2. Point out the correct statement. Explanation: MMAPv1 provides collection-level locking.
Easiest way to find the storage engine being used currently in from mongo console.
Inside mongo console, type (You might need admin access to run this command)
db.serverStatus().storageEngine If It returns,
{ "name" : "wiredTiger" } WireTiger Storage engine is being used.
Once it is confirmed that wiredTiger is being used then type
db.serverStatus().wiredTiger to get all the configuration details of wiredTiger.
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