---
url: /v6.2/en-us/connecting-tdsql-mysql.md
---
# Connect to TDSQL MySQL

### Connection Steps

Please follow the steps below to connect to the `TDSQL MySQL` data source.

1. Click "New Data Connection" in the upper right corner of the data connection page.
   ![](/images/data-connection/connection-001.png)

2. Select the `TDSQL MySQL` data source from the data source types.
   ![](/images/data-connection/connecting-tdsql-mysql-001.png)

3. Fill in the required parameters for the data source connection as prompted.
   ![](/images/data-connection/connecting-tdsql-mysql-002.png)

   **Connection Configuration Information Description**

   | Field                                 | Description                                                                                                    |
   | -------------------------------------- | -------------------------------------------------------------------------------------------------------------- |
   | Name                                  | The name of the connection. Required and unique within the user.                                               |
   | Host Address                          | The address of the database. If the URL field is filled in, the value in the URL will take precedence.         |
   | Port                                  | The port of the database. If the URL field is filled in, the value in the URL will take precedence.            |
   | Username                              | The username for the database.                                                                                 |
   | Password                              | The password for the database.                                                                                 |
   | Database                              | The name of the database.                                                                                      |
   | Max Connections                       | The maximum number of connections in the connection pool.                                                      |
   | Encoding                              | The encoding setting for the database connection.                                                              |
   | Prefer using database comment as dataset title | Whether to display the table name or the table comment as the title.                                   |
   | URL                                   | The JDBC URL of the database.                                                                                  |
   | Transaction isolation level for read operations | This setting only affects reading data; writing data still uses the default isolation level.           |
   | Hierarchical loading of schema and tables      | Default is off. When enabled, schemas and tables are loaded hierarchically. Only schemas are loaded during connection; you need to click the schema to load the tables under it. |
   | Query timeout (seconds)                | Default is 600. For large data volumes, you can appropriately increase the timeout.                            |
   | Allow write operations                 | Indicates that this connection can be selected as an output connection in [Data Integration](pipeline.md) and [Batch Sync](batch-sync.md). You must have write permissions on the database and pass verification before configuring this parameter. |
   | Support uploading files to specified path      | Indicates the database name where tables generated when creating a local file dataset are stored. You must have write permissions on the database and pass verification before configuring this parameter. |
   | Show only tables under specified database/schema | When this option is selected and the database field is not empty, only tables under this DB will be displayed. |

4. After filling in the parameters, click the `Validate` button to get the validation result (this checks the connectivity between HENGSHI SENSE and the configured data connection; you cannot add the connection if validation fails).

5. After validation passes, `Allow write operations` and `Support uploading files to specified path` will be enabled and can be optionally turned on.

6. Click `Execute Preset Code` to pop up the preset code for this data source, then click the execute button.

7. Click the "Add" button to add the `TDSQL MySQL` connection.

> \[!CAUTION] Please note
>
> 1. Parameters marked with \* are required; others are optional.
> 2. MySQL 5 and below do not support window functions, so [Advanced Calculation](chart-advanced-calculation.md) is not supported; you must enable the [Acceleration Engine](dataset-engine.md) for support.
> 3. When connecting to a data source, you must execute the preset code. Failure to do so will result in certain functions being unavailable during data analysis. In addition, when upgrading from a version prior to 4.4 to 4.4, you need to execute the preset code for existing data connections in the system.