Open a Knowledge Base
Applies to: 
SQL Server
This topic describes how to open an existing knowledge base in Data Quality Services (DQS), and prepare it for domain management, knowledge discovery, or adding a matching policy.
Before You Begin
Prerequisites
To open a knowledge base, the knowledge base must have already been created, and either published (if another person created it) or have been closed (if you created it).
Security
Permissions
You must have the dqs_kb_editor role or the dqs_administrator on the DQS_MAIN database to open a knowledge base.
Open a knowledge base
Start Data Quality Client. For information about doing so, see Run the Data Quality Client Application.
In the Data Quality Client home screen, click Open knowledge base.
Select a knowledge base in the table. The domains and matching rules in the knowledge base will be displayed in the right-hand pane of the page.
Note
You can perform operations on a knowledge base by right-clicking it in the table. You can open the knowledge base, save it with another name, unlock it, discard the work, rename it, or display its properties.
In Select Activity, select the activity that you want to perform on the knowledge base:
Select Domain Management to enter the screens that you use to modify the domains in the knowledge base.
Select Knowledge Discovery to enter the wizard that you use to analyze a data sample and populate the domains of the knowledge base with the results.
Select Matching Policy to create a matching policy and add it to the knowledge base.
Click Open.
Note
You can also open the knowledge base by right-clicking it, and then clicking Open. Other commands in the context menu enable you to save it with another name, unlock it, discard the work, rename it, or display its properties.
Note
If you cannot open the knowledge base because it is locked, see the section below.
Open a Recent Knowledge Base
The five most recently opened knowledge bases are displayed in the Recent Knowledge Base list in the DQS home page. This enables you to open a knowledge base that you recently worked on without going through the Open Knowledge Base page.
To open a knowledge base in the Recent list that is not locked, click the right arrow for the knowledge base, and then select the activity that you want to open the knowledge base in.
To open a knowledge base in the Recent list that you locked, click the knowledge base and it will open in the activity and page indicated in parentheses.
To open a knowledge base in the Recent list that has been locked by someone else, contact that person and have them unlock the knowledge base.
Follow Up: After Opening a Knowledge Base
After you open a knowledge base, the knowledge base is put into the state indicated in the State column of the Knowledge Base table. For the knowledge discovery and matching policy activities, the knowledge base will be opened in a specific wizard page. For the domain management activity, the knowledge base will be opened in the domain management page. For more information about the states, see Perform Knowledge Discovery, Managing a Domain, or Create a Matching Policy.
If the knowledge base is locked
The lock icon in the first column shows whether the knowledge base is locked. The name of a locked knowledge base will be in red font. A knowledge base that is being modified by a specific user through a knowledge base activity is marked as Locked. A locked knowledge base cannot be worked on by a second user. The user who is working on the knowledge base can unlock it by right-clicking the knowledge base in the table on the Open Knowledge Base page, and clicking Unlock, or by publishing it. When the cursor is positioned on a locked knowledge base, DQS will display a hint showing who locked the knowledge base and when they locked it.
State of a Knowledge Base
The State field indicates which stage of an activity the knowledge base is at. If you open the knowledge base, it will open to that stage.
<Empty>: The State field is empty for a knowledge base if the knowledge base has been published by clicking Publish in the Domain Management activity, and clicking Yes - Publish the knowledge base and exit.
In Work: Work on the knowledge base has been saved by clicking Publish in the Domain Management activity, and clicking No - Save the work on the knowledge base and exit.
Domain Management: Data has been entered for a domain in the knowledge base, but the knowledge base has not been published and the work remains in the Domain Management activity. The Knowledge Discovery activity is not available. This occurs when you click Close in the Domain Management screen.
Discovery - Mapping: The knowledge base was closed on the Knowledge Base Management: Mapping page. The knowledge base is locked, and the Domain Management and Matching activities are not available.
Discovery - Discover: The knowledge base was closed on the Knowledge Base Management: Analyze page. The knowledge base is locked, and The Domain Management activity is not available.
Discovery - Value Management: The knowledge base was closed on the Knowledge Base Management: Manage Domain Terms page. The knowledge base is locked, and the Domain Management activity is not available.
Matching Policy - Matching Policy: The knowledge base was closed on the Matching Policy - Matching Policy page. The knowledge base is locked, and the Knowledge Discovery and Domain Management activities are not available.
Matching Policy - Matching Results: The knowledge base was closed on the Matching Policy - Matching Results page. The knowledge base is locked, and the Knowledge Discovery and Domain Management activities are not available.