Extjs 4.2 grid paging massive data.

Hi everyone,

I'm having the next problem, I have a grid with paging that is loaded via Ajax,

My problem is that i recieve about 8 millions of records,

When I use paging i get from 1 to 25...etc

but when i load the pagingbar store it only gives me that i have onle 25 records because my ajax only calls from 1 to 25... why is this? any ideas?

regards