What is the minimum number of nodes required to set up a MongoDB replica set?
2
7
1
3
When are transactions in MongoDB typically considered essential?
When performing read-only operations to ensure consistent snapshots of data.
When ACID properties are crucial, such as when multiple operations need to succeed or fail together to maintain data consistency.
For improving the performance of individual queries.
For all database operations to guarantee data integrity.
How can you improve the performance of a $lookup operation in MongoDB?
Use $project to limit fields returned after the $lookup
Avoid using $lookup altogether
Use $match to filter documents before the $lookup stage
Use $sort after the $lookup stage
Which of the following is a key advantage of using a sharded cluster in MongoDB?
Improved write performance by distributing writes across shards
Reduced memory consumption compared to a standalone deployment
Automatic failover and high availability without the need for replica sets
Simplified data modeling and schema design
When should you consider using a hashed index in MongoDB?
For highly selective queries on a single field.
When preserving the sort order of results is crucial.
To index geospatial data for location-based queries.
When you need to perform exact value lookups.
Why is it crucial to keep your MongoDB server and client drivers up-to-date?
To ensure backward compatibility with older versions of MongoDB.
To patch known security vulnerabilities that could be exploited by attackers.
To reduce storage costs by using more efficient data compression algorithms.
To benefit from new features and performance improvements.
Which index type in MongoDB is specifically designed to support queries that involve ranges of data?
Geospatial Index
Compound Index
Single Field Index
Text Index
Which sharding strategy distributes data based on ranges of the shard key values?
Zone sharding
Ranged sharding
Hashed sharding
Random sharding
How does creating indexes on appropriate fields impact the performance of aggregation queries in MongoDB?
Indexes are only relevant for find() queries, not aggregation
Indexes can significantly improve aggregation performance
Indexes can negatively affect aggregation performance
Indexes have no impact on aggregation performance
What MongoDB tool is most suitable for visualizing and analyzing query performance?
MongoDB Profiler
mongostat
mongoexport
mongoimport