Link to a Dameng Database

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

**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	-
Agent	Click Select and select the agent created in Managing Agents.	-
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
SSL Encryption	(Optional) If you set this parameter to Yes, CDM can connect to the database (on-premises databases excluded) in SSL encryption mode. Security hardening has been performed on RDS for PostgreSQL. For this reason, when creating a link to RDS for PostgreSQL, set this parameter to Yes.	Yes
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.	'