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Creating a MySQL Link

Updated on 2022-08-17 GMT+08:00

MySQL links are applicable to third-party cloud MySQL services and MySQL created in a local data center or ECS. This tutorial describes how to create a MySQL link.

Prerequisites

  • You have obtained the IP address, port, database name, username, and password for connecting to the MySQL database. In addition, the user must have the read and write permissions on the MySQL database.
  • The on-premises MySQL database can be accessed through the public network. If the MySQL database is deployed on an on-premises data center or a third-party cloud, ensure that an IP address that can be accessed from the public network has been configured for the MySQL database, or the VPN or Direct Connect between the on-premises data center and the cloud service platform has been established.
  • You have created a CDM cluster.

Creating a MySQL Link

  1. Access the CDM console, choose Cluster Management in the navigation pane, locate the target cluster, and choose Job Management > Link Management > Driver Management. The Driver Management page is displayed.

    Figure 1 Uploading a driver

  2. In the upper left corner of the Driver Management page, click Download Driver to download the MySQL driver. For details, see How Do I Obtain a Driver?.
  3. On the Driver Management page, upload the MySQL driver using either of the following methods:

    Click Upload in the Operation column and select a local driver.

    Alternatively, click Copy from SFTP in the Operation column and configure the SFTP Link name and Driver File Path.

  4. On the Cluster Management page, click Job Management of the cluster and choose Links > Create Link to enter the page for selecting the connector, as shown in Figure 2.

    Figure 2 Selecting a connector type

  5. Select MySQL and click Next to configure parameters for the MySQL link.

    Figure 3 Creating a MySQL link
    Table 1 MySQL link parameters

    Parameter

    Description

    Example Value

    Name

    Enter a unique link name.

    mysqllink

    Database Server

    IP address or domain name of the MySQL database

    192.168.1.110

    Port

    MySQL database port

    3306

    Database Name

    Name of the MySQL database

    sqoop

    Username

    User who has the read, write, and delete permissions on the MySQL database

    admin

    Password

    Password of the user

    -

    Use Local API

    Whether to use the local API of the database for acceleration. (The system attempts to enable the local_infile system variable of the MySQL database.)

    Yes

    Use Agent

    Whether to extract data from the data source through an agent

    Yes

    local_infile Character Set

    When using local_infile to import data to MySQL, you can configure the encoding format.

    utf8

    Driver Version

    A driver version that adapts to MySQL

    -

    Agent

    Click Select and select the agent created in Connecting to an Agent.

    -

    Fetch Size

    Number of rows obtained by each request

    1000

    Commit Size

    Obtaining data from the source through the agent

    1000

    Link Attributes

    Custom attributes of the link

    useCompression=true

    Reference Sign

    Delimiter used to separate referenced table names or column names This parameter is left blank by default.

    '

    Batch Size

    Number of rows written each time. It should be less than Commit Size. When the number of rows written reaches the value of Commit Size, the rows will be committed to the database.

    100

  6. Click Save to return to the Links page.

    NOTE:

    If an error occurs during the saving, the security settings of the MySQL database are incorrect. In this case, you need to enable the EIP of the CDM cluster to access the MySQL database.

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