Database Reference
In-Depth Information
Figure 5-6 . The US - State domain from the default DQS knowledge base
Online Reference Data Services
DQS has two types of data it will use to perform cleansing and matching operations;
local data and reference data . Local data make up the values shown on the Domain
Values page in the DQS Client—these are known values that are imported into DQS as
part of the Knowledge Discovery process. The values are stored along with the know-
ledge base in the DQS_MAIN database. If these values change, you must update your
domain with the new values. Reference data is not stored in the knowledge base—it is
queried from an online reference data service. Using online reference data may impact
performance, because your cleansing process will need to call out to an external sys-
tem, but it requires less maintenance since you don't need to worry about keeping val-
ues in sync.
The online, Reference Data Services (RDS) that can be linked to your domains are
configured on the Administration page in the DQS Client. There are two types of data
 
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