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You can also edit and delete the datasources that are saved in the registry (i.e. datasources created using the management console). However, you cannot edit or delete the datasources that are added using configuration files in the <PRODUCT_HOME>/repository/conf/datasources/ directory using the management console. For example, to modify the default <WSO2_CARBON_DB> datasource, you have to change the master-datasources.xml file.