# 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](https://mariadb.com/docs/server/reference/administrative-sql-statements/set-commands/set-transaction#isolation-levels) for details.

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