Usage files(logs) for sharepoint with SSRS

Hello

I have sharepoint server and SQL reporting server. I have log files(two types of log files i.e. .usage and .log) on SQL Reporting server on this folder:

"C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\LOGS"

There are .usage files which takes so much of space. And I dont know what is use of it. But these files are creating every 5 minutes.

I saw the settings for these log files. It occurs every 30 minutes. I am not understanding how I am getting .usage files in this folder every 5 minutes.

Please help me regarding these .usage files.

Thanks in advance