Hi Vinod,
There is a java action in the community commons module called “deleteall”. If you give it a module name and entity then it will delete the entire table in batches. Using this with the combination of the module reflction module, you can build a microflow that clears your entire database.
Edit: Here is an example
https://modelshare.mendix.com/models/d2484d71-46d9-4530-801c-93c2436bf067/delete-entire-database