WhenNOTToUse

When NOT to use

Know when NOTto use the shinything.

Red flags, hidden costs, failure modes, and calmer alternatives before the new favorite tool becomes everyone's problem.

Failure modesCost trapsOps burdenBetter fits
not.use.checkprod-readiness

> evaluate Redis for primary storage

WARN memory-bound dataset

FAIL relational query workload

PASS cache hot-path candidate

Latency<1ms
Durabilityexplicit
Ops costowned

Start here

Red Flags Worth Reading

For tools that look obvious right up until they start owning your calendar.

Decision guideFeatured
RedisDatabases / Caching

When Not to Use Redis

Redis is a poor default when the problem is relational data, durable source-of-truth storage, large values, or unmeasured caching complexity.

7 key reasons10 min readUpdated Aug 15, 2026
Read the decision guide

Most sites hand you the brochure.

We focus on the harder question:

When is it the wrong choice?

Trade-offs before hype

Tools are useful because they make certain things easy. They also make other things harder. Good decisions account for both sides.

Concrete engineering context

The useful answer is rarely "never use it." It is usually "not for this workload, this team, or this failure mode."

Alternatives that fit the problem

Each guide points toward better choices when the popular answer is not the right one.

Pick your nope

Start with the thing someone is already adding to the roadmap.

Search the stack, scan the failure modes, then decide whether the tool still deserves production privileges.