300+ MongoDB Interview Questions Practice Test

1. C

The time period ‘sharding’ in MongoDB refers back to the means of distributing knowledge throughout a number of servers or shards. Sharding is a type of horizontal scaling that enables MongoDB databases to scale out and deal with extra knowledge and extra queries than a single server might handle. Every shard holds a portion of the information and features as a separate database, which permits for environment friendly administration of huge datasets and excessive throughput operations.
2. C
The first goal of utilizing an index in MongoDB is to enhance the effectivity of information retrieval operations. Indexes allow fast lookups by storing a small portion of the gathering’s knowledge in a kind that may be traversed effectively. With out indexes, MongoDB must carry out full assortment scans to fulfill queries, which may be very gradual on giant datasets.
3. C
The ‘Write Concern’ setting in MongoDB dictates the extent of acknowledgment required from MongoDB for write operations. It’s a important configuration that ensures knowledge sturdiness and consistency, and it may be set to numerous ranges relying on the required ensures of information being written efficiently. For instance, writing to a majority of nodes in a duplicate set offers larger sturdiness at the price of decrease write efficiency.
4. B
The oplog (operations log) is a core part of MongoDB’s replication mechanism. It’s a capped assortment that information each operation carried out by the first node. Secondary nodes then use the oplog to copy and apply these operations, making certain that every one members of a duplicate set stay in sync with one another.
5. C
GridFS is a specification in MongoDB for storing and retrieving giant recordsdata that exceed the BSON-document dimension restrict of 16MB. It really works by splitting the file into smaller chunks and storing every chunk as a separate doc. GridFS allows environment friendly administration of huge recordsdata, permitting customers to retailer, retrieve, and replace them in a fashion just like how they work with customary MongoDB paperwork.
The reasons supplied are correct based mostly on the choices given for every query. The pattern questions cowl key ideas in MongoDB corresponding to sharding, indexing, write concern, oplog, and GridFS. These ideas are important for anybody seeking to grasp MongoDB and perceive its capabilities and greatest practices.