MongoDB MongoDB Replication and Sharding 2

Question 1

What is horizontal scaling in MongoDB achieved through?

Accepted Answer

Sharding data across multiple servers

Answer

Sharding distributes data across multiple machines (shards), allowing MongoDB to handle datasets and throughput that exceed single-server capacity.

Question 2

What is a shard key in MongoDB sharding?

Accepted Answer

The field(s) used to partition documents across shards

Answer

The shard key determines how documents are distributed across shards; choosing a good shard key is critical for even data distribution and query efficiency.

Question 3

What is a mongos in a MongoDB sharded cluster?

Accepted Answer

A query router that directs client requests to the appropriate shard(s)

Answer

mongos is a routing service that acts as an interface between the client and the sharded cluster, directing queries and writes to the correct shard(s).

Question 4

What stores cluster metadata in a MongoDB sharded cluster?

Accepted Answer

Config servers (a separate replica set)

Answer

Config servers form a dedicated replica set that stores the cluster's metadata, including chunk ranges and shard locations.

Question 5

What is a chunk in MongoDB sharding?

Accepted Answer

A contiguous range of shard key values that MongoDB migrates as a unit

Answer

Chunks are contiguous ranges of shard key values; MongoDB automatically splits and migrates chunks to balance data across shards.

MongoDB Practice Test

MongoDB Practice Test

MongoDB MongoDB Replication and Sharding 2