If you are doing data transition ,its tedious task to export and import data when you have data limit (default limit CSV,XML,JSON export limit is 10k rows).

An Export sets allow you to push data from an instance to an external file.A good way to export huge data without hampering system performance.

Note: You must use a MID Server from the Geneva release or later. Earlier MID Server releases do not support export sets. Export sets are not supported on MID Servers in a cluster.

Steps:

1. Configure export sets from ‘System Export Sets’ application.
2. Configure Export Sets Definition and corresponding ‘Export target’
3. You can schedule an export set or run on demand.
4. Track the export set history from module given under System Export set application.

For more details visit: https://docs.servicenow.com/bundle/newyork-platform-administration/page/administer/export-sets/conce...