Relational vs NoSQL Databases: Which to Choose
Almost every application needs somewhere to keep its data, and the first big decision is whether to use a relational database or a NoSQL one. The right choice shapes how easily your product can grow and how reliable your reporting will be.
This article explains the two families in plain terms so the recommendation in your proposal makes sense, without assuming any database experience on your part.
Relational Databases
Relational databases such as MySQL, PostgreSQL and SQL Server store data in tables of rows and columns, with strict relationships between them. They are the default choice for most business systems because they keep your data consistent and are excellent at complex reporting.
- Strong consistency — the data is always in a valid state.
- Powerful querying with SQL across related tables.
- Mature, well-understood and widely supported.
NoSQL Databases
NoSQL covers several styles — document, key-value, column and graph. They trade some structure for flexibility and very large scale, which suits specific workloads such as huge event streams or flexible content.
- Flexible schema — records need not all look alike.
- Designed to scale horizontally across many servers.
- Often faster for simple, high-volume read and write patterns.
| Need | Better fit |
|---|---|
| Orders, invoices, accounts | Relational |
| Flexible product catalogues | Document NoSQL |
| Massive event logging | Column or key-value NoSQL |
| Complex cross-table reports | Relational |
Frequently Asked Questions
Can a project use both?
Yes. Many systems use a relational database as the source of truth and a NoSQL store for caching or search. We recommend the simplest combination that meets your needs.
Which do you recommend by default?
A relational database, unless your data or scale clearly points to a NoSQL strength. It is the safer starting point for most business applications.
If you need a hand with any of this, your Progressive Robot delivery team is ready to help. Raise a ticket from the Support area of your client portal or speak to your account manager and we will guide you through the next steps.