# Single Copy State

> Keeping only one copy of state, so its loss or unavailability takes down the whole system.

Record: `lexicon:single-copy-state`
Kind: anti-pattern
Layer: [Correctness Core](https://banes-lab.com/records/layer/correctness-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-single-copy-state

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Read Scaling](https://banes-lab.com/records/lexicon/read-scaling.md) and before [Cost/Cold Start](https://banes-lab.com/records/lexicon/cost-cold-start.md).

## Category

- [Self-Healing / Recovery / Deployment Safety](https://banes-lab.com/records/lexicon-category/self-healing-recovery-deployment-safety.md)

## Negated by

- [Replication](https://banes-lab.com/records/architecture/replication.md)

## Linked from

- [Self-Healing / Recovery / Deployment Safety](https://banes-lab.com/ontology/principles/architecture-category-self-healing-recovery-deployment-safety.md)