What is the easy way to find the storage engine currently used in MongoDB?

What is the easy way to find the storage engine currently used in MongoDB?

Easiest way to find the storage engine being used currently in from mongo console. WireTiger Storage engine is being used. to get all the configuration details of wiredTiger.

Which are the two storage engines used by MongoDB?

MongoDB supports mainly 3 storage engines whose performance differ in accordance to some specific workloads….WiredTiger Storage Engine

• WiredTiger Storage Engine.
• In-Memory Storage Engine.
• MMAPv1 Storage Engine.

Which of the following are features of the WiredTiger storage engine?

WiredTiger Storage Engine

• Document Level Concurrency.
• Snapshots and Checkpoints.
• Journal.
• Compression.
• Memory Use.

Which storage engine supports only collection level locking in MongoDB?

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.

Which is the best storage engine for MongoDB?

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. See Encrypted Storage Engine.

What happens to the empty space in MongoDB?

The WiredTiger storage engine maintains lists of empty records in data files as it deletes documents. This space can be reused by WiredTiger, but will not be returned to the operating system unless under very specific circumstances.

How big is the WiredTiger cache in MongoDB?

Starting in MongoDB 3.4, the default WiredTiger internal cache size is the larger of either: 50% of (RAM – 1 GB), or 256 MB. For example, on a system with a total of 4GB of RAM the WiredTiger cache will use 1.5GB of RAM (0.5 * (4 GB – 1 GB) = 1.5 GB).

Is it possible to have multiple replicas in MongoDB?

Yes. You can have replica set members that use different storage engines (WiredTiger and in-memory) Starting in version 4.2, MongoDB removes the deprecated MMAPv1 storage engine. Yes. See: The ratio of compressed data to uncompressed data depends on your data and the compression library used.