The property extension repository adapter is configured using the WebSphere Application Server administrative console or the wsadmin commands. See your WebSphere administrative console documentation. If you need to modify this configuration, you can manually edit the wimconfig.xml file, although this is not the preferred method.
<config:repositories xsi:type="config:PropertyExtensionRepositoryType"
id="LA"
databaseType="db2"
dataSourceName="jdbc/wimLA"
dbURL="jdbc:db2:wim"
dbAdminId="DB_ADMIN_ID"
dbAdminPassword="DB_PASSWORD"/>