# One-Way Index Check

> A defect in which an index is checked in one direction only, so an entry with no file or a file with no entry goes unnoticed.

Record: `lexicon:one-way-index-check`
Kind: anti-pattern
Layer: [Execution Core](https://banes-lab.com/records/layer/execution-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-one-way-index-check

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Overgrown Projection](https://banes-lab.com/records/lexicon/overgrown-projection.md) and before [Single-Word Lifetime](https://banes-lab.com/records/lexicon/single-word-lifetime.md).

## Category

- [Coordination Surfaces](https://banes-lab.com/records/lexicon-category/coordination-surfaces.md)

## Violates

- [Two-Direction Index](https://banes-lab.com/records/architecture/two-direction-index.md)

## Linked from

- [Coordination Surfaces](https://banes-lab.com/ontology/principles/architecture-category-coordination-surfaces.md)