# READ UNCOMMITTED

The isolation level allowing the broadest concurrency and permitting dirty reads.

## What is **READ UNCOMMITTED** in a relational database?

**READ UNCOMMITTED** — The isolation level allowing the broadest concurrency and permitting dirty reads.

```sql
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
```

Level: Journeyman · [More Database terms at this level](https://www.ask-codey.com/glossary/subjects/database/journeyman)

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/read-uncommitted