# Lost Update

Record: `arch:lost-update`
Kind: anti-pattern
Layer: [Enforcement Core](https://banes-lab.com/records/layer/enforcement-core.md)
Severity: discouraged
Scope: state_transaction
Canonical: https://banes-lab.com/ontology#arch-lost-update

## Repair

- Refactored by: [optimistic_locking](https://banes-lab.com/records/arch/optimistic-locking.md), [pessimistic_locking](https://banes-lab.com/records/arch/pessimistic-locking.md), merge_policy, transaction_isolation
- Detected by: last_write_wins_without_version, no_optimistic_lock, concurrent_update_defects
- Violated by: Allow concurrent writers to overwrite each other without version checks, locks, compare-and-swap, or transaction isolation.

## referenced-by

- [Concurrency Control](https://banes-lab.com/records/arch/concurrency-control.md)