You may increase the value of "export_max_fetch_rows" to 10000 by following the below steps:
- Login to Service Desk as an Administrator.
- Click on Administration tab.
- Expand option manager and then click on web.
- At the right-pane, right click on export_max_fetch_rows and then click on Edit Button.
- Now change the option value to 10000 and click on Save.
- Recycle the services of Service Desk.
Note: The maximum value for "export_max_fetch_rows" can be up to 15000.