Hi Kazuki,
PLease go through the below doc and
http://help.sap.com/hana/Whats_New_SAP_HANA_Platform_Release_Notes_en.pdf
statisticsserver service) is no longer required. By replacing the statistics server with internal procedure calls, overall system performance is improved with reduced disk usage, memory usage, and data transfer.
Please go through statistics server changed page no 14 .
You will get answer for this.
BR
Atul