Magento Questions Asked in Interview

You don’t need to create a database manually in MongoDB because it creates automaically when you save the value into the defined collection at first time. In MongoDB, databases are created automatically when you first store data in them. Unlike some traditional relational database systems where you explicitly need to create a database before using … Read more

Difference between MongoDB and Cassandra: MongoDB is cross-platform document-oriented database system while Cassandra is high performance distributed database system. MongoDB is written in C++ while Cassandra is written in Java. MongoDB is easy to administer in the case of failure while Cassandra provides high availability with no single point of failure. MongoDB and Cassandra are … Read more

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. MongoDB and CouchDB are both NoSQL databases, but they have some key differences … Read more

Difference between MongoDB and Redis: Redis is faster than MongoDB. Redis has a key-value storage whereas MongoDB has a document type storage. Redis is hard to code but MongoDB is easy. MongoDB and Redis are both popular NoSQL databases, but they serve different purposes and have different characteristics. Here are some key differences between MongoDB … Read more

MongoDB uses reader-writer locks for concurrency. Reader-writer locks allow concurrent readers shared access to a resource, such as a database or collection, but give exclusive access to a single write operation. MongoDB provides concurrency through a combination of mechanisms to support simultaneous access to data by multiple users or processes. Here are some key features … Read more