Which are the storage engines used by MongoDB?
MMAPv1 and WiredTiger are two storage engine used by MongoDB.
What is the difference between MongoDB and CouchDB?
Difference between MongoDB and CouchDB:
- MongoDB is faster than CouchDB while CouchDB is safer than MongoDB.
- Triggers are not available in MongoDB while triggers are available in CouchDB.
- MongoDB serializes JSON data to BSON while CouchDB doesn’t store data in JSON format.
Is MongoDB better than other SQL databases? If yes then how?
MongoDB is better than other SQL databases because it allows a highly flexible and scalable document structure.
For example:
- One data document in MongoDB can have five columns and the other one in the same collection can have ten columns.
- MongoDB database are faster than SQL databases due to efficient indexing and storage techniques.
Can journaling features be used to perform safe hot backups?
Yes.
Does MongoDB need a lot of RAM?
No. There is no need a lot of RAM to run MongoDB. It can be run even on a small amount of RAM because it dynamically allocates and de-allocates RAM according to the requirement of the processes.
Does MongoDB database have tables for storing records?
No. Instead of tables, MongoDB uses “Collections” to store data.