Advanced – Cloud & Data Testing
ACID – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
A set of properties — Atomicity, Consistency, Isolation, Durability — guaranteeing reliable database transactions.
In simple words
The four properties that make database transactions safe.
Exam tip
ACID is the classic contrast with BASE (eventually consistent) NoSQL systems.
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