--- toc_priority: 20 toc_title: MySQL Interface --- # MySQL Interface {#mysql-interface} ClickHouse supports MySQL wire protocol. It can be enabled by [mysql_port](../operations/server-configuration-parameters/settings.md#server_configuration_parameters-mysql_port) setting in configuration file: ``` xml 9004 ``` Example of connecting using command-line tool `mysql`: ``` bash $ mysql --protocol tcp -u default -P 9004 ``` Output if a connection succeeded: ``` text Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 4 Server version: 20.2.1.1-ClickHouse Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> ``` For compatibility with all MySQL clients, it is recommended to specify user password with [double SHA1](../operations/settings/settings-users.md#password_double_sha1_hex) in configuration file. If user password is specified using [SHA256](../operations/settings/settings-users.md#password_sha256_hex), some clients won’t be able to authenticate (mysqljs and old versions of command-line tool mysql). Restrictions: - prepared queries are not supported - some data types are sent as strings To cancel a long query use `KILL QUERY connection_id` statement (it is replaced with `KILL QUERY WHERE query_id = connection_id` while proceeding). For example: ``` bash $ mysql --protocol tcp -h mysql_server -P 9004 default -u default --password=123 -e "KILL QUERY 123456;" ``` [Original article](https://clickhouse.com/docs/en/interfaces/mysql/)