Learn about the key elements of NoSQL databases, including primary keys, schemas, tables, constraints, and delimiters. Prepare for the CompTIA FC0-U61 exam.
Table of Contents
Question
Which of the following is an element of a NoSQL database?
A. Primary keys
B. Constraints
C. Schema
D. Tables
E. Delimiters
Answer
A. Primary keys
Explanation
NoSQL databases differ from traditional relational databases in their structure and elements. Some key characteristics of NoSQL databases include:
- They use a non-relational data model, meaning data is not stored in tables with rigid schemas
- They are schema-less or have flexible schemas that allow adding fields on the fly
- They distribute data across multiple servers for scalability and partition tolerance
- They often use primary keys for looking up values, similar to key-value stores
So while NoSQL databases don’t use fixed schemas, constraints, or relational tables like SQL databases do, they do typically make use of primary keys for retrieving data values. The other elements like constraints, schemas, tables, and delimiters are more associated with relational SQL databases rather than NoSQL.
Therefore, of the given options, primary keys are the element most commonly used in NoSQL database systems. The flexibility and scalability of NoSQL comes at the expense of the rigid structure provided by things like schemas and constraints in SQL databases.
CompTIA FC0-U61 certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the CompTIA FC0-U61 exam and earn CompTIA FC0-U61 certification.