MySQL

MySQL is a managed database service for deploying cloud-native applications, and this topic describes how to configure a MySQL database as a Dremio Sonar source.

Prerequisites

Ensure that you have the following details before configuring MySQL as a source:

• Hostname or IP address
• Port

Dremio MySQL Configuration

Perform these steps to configure MySQL as a source:

1. In the Datasets UI, you can see a truncated list of Sources at the bottom-left of the page. Click + Add Source.

   

   Alternatively, click Databases. The page displays all database sources. Click the Add database button at the top-right of that page.

2. In the Add Data Source dialog, click MySQL.

   The following section describes the source configuration tabs.

General

The General tab contains the required fields to create a MySQL source.

Perform these steps in the General tab:

1. In the General tab, for Name, enter a name.
2. For Host, enter the MySQL host name.
3. For Port, enter the MySQL port number. The default port is 3306.
4. For Authentication, Master Authentication is the default and the only option. Provide the username and password of a master database user with permissions to read required objects:

• For Username, enter your MySQL database username.
• For Password, enter your MySQL database password.

Advanced Options

Click Advanced Options in the sidebar.

Reflection Refresh

The Reflection Refresh tab in the sidebar allows you to set time intervals for reflections to refresh or expire.

Metadata

You can configure settings to refresh metadata and handle datasets. Click Metadata in the sidebar.

You can configure Dataset Handling and Metadata Refresh parameters.

Dataset Handling

These are the Dataset Handling parameters.

Metadata Refresh

These are the Metadata Refresh parameters:

• Dataset Discovery: The refresh interval for fetching top-level source object names such as databases and tables. Set the time interval using this parameter.

  Parameter	Description
  (Optional) Fetch every	You can choose to set the frequency to fetch object names in minutes, hours, days, or weeks. The default frequency to fetch object names is 1 hour.

• Dataset Details: The metadata that Sonar needs for query planning such as information required for fields, types, shards, statistics, and locality. These are the parameters to fetch the dataset information.

Privileges

You can grant privileges to specific users or roles.

1. (Optional) For Privileges, enter the user name or role name that you want to grant access to and click the Add to Privileges button. The added user or role is displayed in the Users table.
2. (Optional) For the users or roles in the Users table, toggle the green checkmark for each privilege you want to grant to the MySQL source that is being created.

Click Save after setting the configuration.

Editing a MySQL Source

To edit a MySQL source:

1. In the Datasets UI, click Databases. A list of databases is displayed.
2. Under the Actions column, click the Settings (gear) icon for the source you want to edit. From the list of actions, click Edit Details.

3. In the Edit Source dialog, you cannot edit the name. Editing other parameters is optional.
4. Click Save.

Removing a MySQL Source

To remove a MySQL source, perform these steps:

1. In the Datasets UI, click Databases. A list of sources is displayed.
2. Under the Actions column, click the Settings (gear) icon for the source that you want to remove.

3. From the list of actions, click Remove Source. Confirm that you want to remove the source.

Predicate Pushdowns

Dremio offloads these operations to MySQL.