I was able to successfully migrate all views from Denodo Platform 7.0 to Denodo Platform 8.0, by executing the below command in the VQL shell in Denodo Platform 7.0 by login as an administrator account.
SET 'com.denodo.exportMigrationCompatibility' = 'true';
SET 'com.denodo.vdb.catalog.exportOnlyResources' = 'true';
To export metadata, I have utilized the export script available in the <DENODO_HOME>/bin. Then I have imported that metadata file using the import script located at <DENODO_HOME>/bin in the Denodo Platform 8.0.
To get more information related to migration steps, you could refer to the following documents,
* [Export the Settings and Metadata of the Current Installation](https://community.denodo.com/docs/html/browse/8.0/platform/upgrade/export_the_metadata_of_the_current_installation#export-the-settings-and-metadata-of-the-current-installation).
* [Import Settings and Metadata into the New Installation](https://community.denodo.com/docs/html/browse/8.0/platform/upgrade/import_the_metadata_to_the_new_installation#import-settings-and-metadata-in-to-the-new-installation).
Hope this helps!