> 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-serializable.md).

# SERIALIZABLE

`SERIALIZABLE` is one of the transaction isolation levels. Similar to `REPEATABLE READ`, but InnoDB implicitly converts all plain `SELECT` statements to `SELECT ... LOCK IN SHARE MODE` if autocommit is disabled.

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

<sub>*This page is licensed: CC BY-SA / Gnu FDL*</sub>

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