There are many case where you want to deal with huge amount of data in sharepoint list, whereas you need to bypass the threshold limit of a particular sharepoint list. So to override the default throttling settings. just execute the below powershell to add list items more than the threshold limits.
web = Get-SPWeb -Identity http://mysite
$web.AllowUnsafeUpdates = $True
$list = $web.Lists["ListName"]
$list.EnableThrottling = $False
$list.Update()
$web.AllowUnsafeUpdates = $False
$web.Update()
$web.Dispose()