Link to a Dameng Database

When connecting CDM to a Dameng database, configure the parameters as described in Table 1.

Do not change the password or user when the job is running. If you do so, the password will not take effect immediately and the job will fail.

**Table 1** Parameters for a link to a Dameng 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	dm_link
Database Server	IP address or domain name of the database to connect Click Select next to the text box and select a DWS or RDS DB instance in the displayed dialog box.	192.168.0.1
Port	Port of the database to connect	The port number varies depending on the database.
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	-
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
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.	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.	'