I exported datatables separately from one server using (to file, single data, datatables option) and import in another server using (from file, data, file repository, browse) to get the values in it. Once import is successful, not able to reimport the same file again any servers. .import file also not present. then what is the reason for this skipping import while reusing same file. If i exported again, then that file is importing successfully for only one time. How to reuse the file?
When you say 'not able to import' do you get a failure message?
Or are you trying to 'reset' the data in the datatable?
If the second scenario, have you tried to 'purge' the entries from the DataTable before importing again?
Is it perhaps importing in the wrong order? i.e. the actual DataTable doesn't yet exist so it can't import the data?
Have you tried just importing the datatable data content after you've imported the entities?
What you experienced here is the default behavior when importing (at least) DataTables.
The reason is the following: when you export a DataTable, it generates just two files in the folder, a twx (contains data) and a chk (some sort of hash I presume).
The first time you import such a folder, ThingWorx generates an additional .import.log file, which, if you imported successfully the data, attests the import process finished successfully. Subsequent attempts to import check this file, and basically skips the data import if you already imported it once (data import can be quite intensive, and this is meant to be an optimization feature).
To bypass this functionality simply delete the .import.log file from the specific File Repository path and retry the import.