# Single Instance Dependency

> Depending on a single instance with no standby, so its failure takes down the whole service.

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

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Health Detection](https://banes-lab.com/records/lexicon/health-detection.md) and before [Replication or Alternate Capacity](https://banes-lab.com/records/lexicon/replication-or-alternate-capacity.md).

## Category

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

## Negated by

- [Failover](https://banes-lab.com/records/architecture/failover.md)

## Linked from

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