Technical Interview Questions
Yes, These files can be deleted once the operations are done because these files are made as backups during normal shard balancing operation. This is a manual cleanup process and necessary to free up space. In MongoDB, the moveChunk directory is used during the process of sharding to store temporary files related to moving chunks … Read more
Because MongoDB uses memory mapped files so when you run a 32-bit build of MongoDB, the total storage size of server is 2 GB. But when you run a 64-bit build of MongoDB, this provides virtually unlimited storage size. So 64-bit is preferred over 32-bit. The 32-bit version of MongoDB is not preferred for several … Read more
MongoDB doesn’t use traditional locking or complex transaction with Rollback. MongoDB is designed to be light weighted, fast and predictable to its performance. It keeps transaction support simple to enhance performance. MongoDB supports multi-document transactions starting from version 4.0. With multi-document transactions, you can perform multiple operations on one or more documents within a single … Read more
MongoDB’s cache is not configurable. Actually MongoDb uses all the free spaces on the system automatically by way of memory mapped files. In MongoDB, there isn’t a direct method to configure a cache size in the same way you might configure a cache size for some other databases. MongoDB relies on the operating system’s virtual … Read more
Yes. MongoDB databases have dynamic schema. There is no need to define the structure to create collections. MongoDB is often described as a “schema-less” or “schema-free” database because it allows for flexible and dynamic document structures. Unlike traditional relational databases, MongoDB does not enforce a rigid, predefined schema for the data stored in its collections. … Read more