# Externalized State

> The requirement that session or request state be held outside the serving instance, in a shared store.

Record: `lexicon:externalized-state`
Kind: constraint
Layer: [Performance Core](https://banes-lab.com/records/layer/performance-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-externalized-state

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Complexity Model](https://banes-lab.com/records/lexicon/complexity-model.md) and before [Input Size Model](https://banes-lab.com/records/lexicon/input-size-model.md).

## Category

- [Scalability / Performance / Optimization](https://banes-lab.com/records/lexicon-category/scalability-performance-optimization.md)

## Required by

- [Statelessness](https://banes-lab.com/records/architecture/statelessness.md)

## Linked from

- [Scalability / Performance / Optimization](https://banes-lab.com/ontology/principles/architecture-category-scalability-performance-optimization.md)