@Rutvik Rana, you cannot use Datalink API to pull from DEV space because it is real time calculation. If it is only a few files you need, then just export to TSV in the DEV space. Otherwise, you need to check in and wait until Stage is fully calculated. Also, bear in mind that the Build # for Stage has to be different than Production (if you have a Production site setup); otherwise the extract will fail. In other words, try not to promote to Production before you finish extracting the tables.