Everyday poweshell scripts for sharepoint. Originally found on http://www.vrdmn.com/2012/10/everyday-powershell-scripts-for.html

everyday.sp2013.ps1

#add indexes to a field on a list

Add-PsSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue
 
function IndexField($fieldName, $spList)
{
    $spField = $spList.Fields[$fieldName]
    
    $spField.Indexed = $true
    $spField.Update()
    $spList.FieldIndexes.Add($spField)
    $spList.Update()
    
    Write-Host "$fieldName Indexed"
}
 
try
{
    $SiteUrl = "http://spsa00:6000/"
	
    $web = Get-SPWeb $SiteUrl
	
    $spList = $web.Lists["Tasks"]
	
    IndexField "Assigned To" $spList
    IndexField "Status" $spList
	
    $web.Dispose()
}
Catch [system.exception]
{
  $error[0]
}

#clear cache

Add-PsSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue
 
$site = Get-SPSite "http://spsa00:7766/"
 
$cache = New-Object Microsoft.SharePoint.Publishing.SiteCacheSettingsWriter $site
 
$cache.SetFarmCacheFlushFlag()
 
$cache.Update()
 
Write-Host "Object Cache Cleared"

#Enable Developer Dashboard

Add-PsSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue
 
$ddb = [Microsoft.SharePoint.Administration.SPWebService]::ContentService.DeveloperDashboardSettings
 
#On, Off, OnDemand
$ddb.DisplayLevel = [Microsoft.SharePoint.Administration.SPDeveloperDashboardLevel]::OnDemand
 
$ddb.RequiredPermissions = 'EmptyMask'
 
$ddb.TraceEnabled = $true
 
$ddb.Update()
 
Write-Host "Developer Dashboard Enabled"