Discussion
Which of the following statement(s) is/are correct ?
(i) Documents can contain many different key value pairs, or key array pairs but not nested documents
(ii) Mango DB was official drivers for a variety of popular programming languages and development environments
(iii) When compared to relational databases, No SQL databases are more scalable and provide superior performance
Answer: C
Statements (ii) and (iii) are correct, so the answer is (ii) and (iii).
Statement (i) is false: a MongoDB document can contain key-value pairs, arrays and nested (embedded) documents, and embedding related data in one document is one of the main features of the document model.
Statement (ii) is true: MongoDB (printed 'Mango DB') provides official drivers for many popular programming languages and environments. Statement (iii) reflects the usual claim for NoSQL systems: they are built to scale horizontally across many servers and to give high performance on large volumes of data, compared with traditional relational databases.
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