> ## Documentation Index
> Fetch the complete documentation index at: https://clickhouse.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.
> Looker Studio, formerly Google Data Studio, is an online tool for converting data into customizable informative reports and dashboards.
# Looker Studio
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Looker Studio can connect to ClickHouse via the MySQL interface using the official Google MySQL data source.
ClickHouse Cloud setup
Select Connect your app} id="select-connect-your-app">
After creating your ClickHouse Cloud Service, on the `Connect your app` screen, select MySQL from the drop down.
Toggle the switch to enable the MySQL interface for this specific service.
This will expose port `3306` for this service and prompt you with a MySQL connection screen that includes your unique MySQL username.
Alternatively, in order to enable the MySQL interface for an existing service:
Select Connect} id="select-connect">
Ensure your service is in `Running` state then click on the service you want to enable the MySQL interface for.
Select "Connect" from the left menu:
Choose MySQL} id="choose-mysql">
Select `MySQL` from the `Connect With` drop down.
Toggle the switch to enable the MySQL interface for this specific service.
This will expose port `3306` for this service and prompt you with your MySQL connection screen that include your unique MySQL username.
Creating a readonly MySQL user in ClickHouse Cloud
ClickHouse Cloud automatically creates a `mysql4` user that shares the same password as the default user.
The `` portion corresponds to the first part of your ClickHouse Cloud hostname.
This username format is required for compatibility with tools that establish secure connections but don't include [SNI (Server Name Indication)](https://www.cloudflare.com/learning/ssl/what-is-sni) data in their TLS handshake.
Without SNI information, the system can't perform proper internal routing, so the subdomain hint embedded in the username provides the necessary routing information.
The MySQL console client is an example of a tool that requires this.
A recommended best practice is to create a new readonly MySQL user.
For a ClickHouse Cloud hostname like `foobar.us-east1.aws.clickhouse.cloud`, the `` part equals to `foobar`, and a custom MySQL username could look like `mysql4foobar_team1`.
Create a [settings profile](/docs/reference/statements/create/settings-profile) to apply to your readonly user,
setting the `readonly` setting to `1`:
```sql theme={null}
CREATE SETTINGS PROFILE readonly_profile SETTINGS readonly = 1
```
[Create a user](/docs/reference/statements/create/user) with a name following this format:
```sql theme={null}
mysql4_
```
Apply the `readonly_profile` to the new user and make sure that the password is in double SHA1 format. For example:
```sql theme={null}
CREATE USER mysql4foobar_readonly
IDENTIFIED WITH double_sha1_password BY 'YourPassword42$'
SETTINGS PROFILE 'readonly_profile';
```
[Grant](/docs/reference/statements/grant) the new user the necessary permissions to interact with the desired tables or databases.
For example, if you want to grant access to `system.query_log` only:
```sql theme={null}
GRANT SELECT ON system.query_log TO mysql4foobar_readonly;
```
For the readonly user, make sure to only grant `SELECT` permissions to the tables you want to access.
The newly created user can be used to connect to your ClickHouse Cloud service with the MySQL interface.
Troubleshooting multiple MySQL users in ClickHouse Cloud
If you created a new MySQL user, and you see the following error while connecting via MySQL CLI client:
```
ERROR 2013 (HY000): Lost connection to MySQL server at 'reading authorization packet', system error: 54
```
In this case, ensure that the username follows the `mysql4_` format, as described ([above](#creating-multiple-mysql-users-in-clickhouse-cloud)).
On-premise ClickHouse server setup
Please refer to [the official documentation](/docs/concepts/features/interfaces/mysql)
on how to set up a ClickHouse server with enabled MySQL interface.
Aside from adding an entry to the server's `config.xml`
```xml theme={null}
9004
```
it is also *required* to use
[Double SHA1 password encryption](/docs/concepts/features/configuration/settings/settings-users#user-namepassword)
for the user that will be using MySQL interface.
Generating a random password encrypted with Double SHA1 from the shell:
```shell theme={null}
PASSWORD=$(base64 < /dev/urandom | head -c16); echo "$PASSWORD"; echo -n "$PASSWORD" | sha1sum | tr -d '-' | xxd -r -p | sha1sum | tr -d '-'
```
The output should look like the following:
```
LZOQYnqQN4L/T6L0
fbc958cc745a82188a51f30de69eebfc67c40ee4
```
The first line is the generated password, and the second line is the hash we could use to configure ClickHouse.
Here is an example configuration for `mysql_user` that uses the generated hash:
`/etc/clickhouse-server/users.d/mysql_user.xml`
```xml theme={null}
fbc958cc745a82188a51f30de69eebfc67c40ee4
::/0
default
default
```
Replace `password_double_sha1_hex` entry with your own generated Double SHA1 hash.
Additionally, it is recommended to use `use_mysql_types_in_show_columns`
to show the native MySQL types instead of ClickHouse ones in `SHOW [FULL] COLUMNS` query results,
which allows BI tools to properly introspect the database schema when using MySQL connectors.
For example:
`/etc/clickhouse-server/users.d/mysql_user.xml`
```xml theme={null}
1
```
or assign it to a different profile instead of the default one.
If you have the `mysql` binary available, you can test the connection from the commandline.
Using the sample username (`mysql_user`) and password (`LZOQYnqQN4L/T6L0`) from above the command line would be:
```bash theme={null}
mysql --protocol tcp -h localhost -u mysql_user -P 9004 --password=LZOQYnqQN4L/T6L0
```
```
mysql> show databases;
+--------------------+
| name |
+--------------------+
| INFORMATION_SCHEMA |
| default |
| information_schema |
| system |
+--------------------+
4 rows in set (0.00 sec)
Read 4 rows, 603.00 B in 0.00156 sec., 2564 rows/sec., 377.48 KiB/sec.
```
Finally, configure the Clickhouse Server to listen on the desired IP address(es). For example, in `config.xml`, uncomment out the following to listen on all addresses:
```bash theme={null}
::
```
Connecting Looker Studio to ClickHouse
First, login to [https://lookerstudio.google.com](https://lookerstudio.google.com) using your Google account and create a new Data Source:
Search for the official MySQL connector provided by Google (named just **MySQL**):
Specify your connection details. Please note that MySQL interface port is 9004 by default,
and it might be different depending on your server configuration.
Now, you have two options on how to fetch the data from ClickHouse. First, you could use the Table Browser feature:
Alternatively, you could specify a custom query to fetch your data:
Finally, you should be able to see the introspected table structure and adjust the data types if necessary.
Now you can proceed with exploring your data or creating a new report!
Using Looker Studio with ClickHouse Cloud
When using ClickHouse Cloud, you need to enable MySQL interface first. You can do that in connection dialog, "MySQL" tab.
In the Looker Studio UI, choose the "Enable SSL" option. ClickHouse Cloud's SSL certificate is signed by [Let's Encrypt](https://letsencrypt.org/certificates/). You can download this root cert [here](https://letsencrypt.org/certs/isrgrootx1.pem).
The rest of the steps are the same as listed above in the previous section.
