Link to a MySQL Database

Table 1 lists the parameters for a link to a MySQL database.

**Table 1** Parameters for a link to a MySQL database
Parameter	Description	Example Value
Name	Link name, which should be defined based on the data source type, so it is easier to remember what the link is for	mysql_link
Database Server	IP address or domain name of the database to connect Click Select next to the text box and select a MySQL DB instance in the displayed dialog box.	192.168.0.1
Port	Port of the database to connect	3306
Database Name	Name of the database to connect	dbname
Username	Username used for accessing the database This account must have the permissions required to read and write data tables and metadata.	cdm
Password	Password of the user	-
Use Local API	(Optional) Whether to use the local API of the database for acceleration. When you create a MySQL link, CDM automatically enables the local_infile system variable of the MySQL database to enable the LOAD DATA function, which accelerates data import to the MySQL database. If CDM fails to enable this function, contact the database administrator to enable the local_infile system variable. Alternatively, set Use Local API to No to disable API acceleration. If data is imported to RDS for MySQL, the LOAD DATA function is disabled by default. In such a case, you need to modify the parameter group of the MySQL instance and set local_infile to ON to enable the LOAD DATA function. NOTE: If local_infile on RDS is uneditable, it is the default parameter group. You need to create a parameter group, modify its values, and apply it to the RDS for MySQL instance. For details, see the Relational Database Service User Guide.	Yes
Use Agent	Whether to extract data from the data source through an agent	Yes
Agent	Click Select and select the agent created in Managing Agents.	-
local_infile Character Set	When using local_infile to import data to MySQL, you can configure the encoding format.	utf8
Driver Version	Select a driver version that adapts to the database type.	-
Fetch Size	(Optional) Displayed when you click Show Advanced Attributes. Number of rows obtained by each request. Set this parameter based on the data source and the job's data size. If the value is either too large or too small, the job may run for a long time.	1000
Commit Size	(Optional) Displayed when you click Show Advanced Attributes. Number of records submitted each time. Set this parameter based on the data destination and the job's data size. If the value is either too large or too small, the job may run for a long time.	-
Link Attributes	(Optional) Click Add to add the JDBC connector attributes of multiple specified data sources. For details, see the JDBC connector document of the corresponding database. NOTE: By default, useCursorFetch is enabled, indicating that the JDBC connector communicates with relational databases using the binary protocol. The open-source MySQL database supports the useCursorFetch parameter. You do not need to set this parameter.	sslmode=require
Reference Sign	(Optional) Delimiter between the names of the referenced tables or columns. For details, see the product documentation of the corresponding database.	'
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