Server side processing of 200 000 rows but Allowed memory size of exhausted and Invalid JSON respons

Hello,

I tried to use Datatable for displaying a long query of 250 000 rows with 22 columns. For that, I use server side processing, but with SSP::complex and joins table. I don't have any error in the sql query (when I test it in phpmyadmin this display well all the rows), but in my json return I have the error "Allowed memory size of 536870912 bytes exhausted ". And in my datatable "Invalid JSON response" (due to the allowed memory error ?).

I thought server side processing ask automtically the database with limit query to have only a smaller number of rows than the entire count of result.

Did I miss something or done something wrong ?