MCQs
Any field in a MongoDB document can be indexed.
The aggregation framework enables users to obtain the kind of results for which the SQL GROUP BY clause is used.
The data is split into ranges (based on the shard key) and distributed across multiple shards.
MongoDB is the most popular NoSQL database system.
Document databases pair each key with a complex data structure known as a document.
Wide-column stores such as Cassandra and HBase are optimized for queries over large datasets, and store columns of data together, instead of rows.
MongoDB does not support collation-based sorting and is limited to byte-wise comparison via memcmp.
Wide-column stores such as Cassandra and HBase are optimized for queries over large datasets, and store columns of data together, instead of rows.
There's also no way, using a relational database, to effectively address data that's completely unstructured or unknown in advance.
MongoDB (from humongous) is a cross-platform document-oriented database.