Hi @Santosh, you can see how SPICE capacity is calculated here. The size will depend on the datatypes you’re importing, but also includes any calculated fields that you’re defining in your data preparation stage. Also, SPICE is designed to enhance query performance and so will not directly reflect the same storage mechanism as your source.
Have a look at the doc and see if that makes sense. If you think the size is still excessive I would recommend you open a support ticket.