The configuration parameter page_load_data_from_oneim_server_full_load is used for performing full synchronization on the page load. This parameter takes Boolean value (default value is false) and setting the value to true would perform a full sync.
NOTE: Full synchronization should not be performed on the catalog page since it will lead to significant performance degradation. Full synchronization should be done only through the job service described earlier. Full synchronization through catalog page should be used only for testing purposes.