Operational Datastore Selection Relational And NoSQL

Overview

Use this skill when the real decision is not warehouse modeling, but what operational datastore should hold state, serve requests, or back data-driven application flows. It helps agents choose intentionally between relational systems such as MySQL and PostgreSQL versus NoSQL families such as document, key-value, wide-column, or cache-oriented stores.

When to Use

• choosing MySQL versus NoSQL for application-facing or service-facing data
• selecting stores for metadata, idempotency keys, session state, event state, or operational APIs
• deciding whether flexible schema or strict relational constraints matter more
• evaluating consistency, scale, and access-pattern trade-offs
• preventing analytics or pipeline systems from being misused as OLTP stores

Do not treat datastore selection as a brand preference or trend decision.

Workflow