> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/server/reference/sql-statements/transactions/transactions-read-uncommitted.md).

# READ UNCOMMITTED

`READ UNCOMMITTED` is one of the transaction isolation levels. `SELECT` statements are performed in a non-locking fashion, but a possible earlier version of a row might be used.

See [Isolation Levels](/docs/server/reference/sql-statements/administrative-sql-statements/set-commands/set-transaction.md#isolation-levels) for details.

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