Using PowerShell script how to increase the SharePoint site size.

Power shell command to increase the site size.

    Add-PsSnapin Microsoft.SharePoint.PowerShell

## SharePoint DLL

[void][System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint")

$docSize = 524288000

$webservice = [Microsoft.SharePoint.Administration.SPWebService]::ContentService

$webservice.MaxTemplateDocumentSize = $docSize

$webservice.Update()