Peter Hinchley

Learning in Public

✪ Configure the Refresh Cycle of Microsoft SCCM Collections using PowerShell

It's not uncommon to encounter thousands of collections in a large deployment of Microsoft SCCM. If the refresh cycle of the collections is not carefully managed, you may start to experience significant performance degradation. As a rule of thumb, you should not enable incremental updates on more than 200 collections, or configure too many collections with an aggressive periodic refresh cycle.

The following PowerShell script includes a few functions that can help to manage the refresh cycle of collections.

The get-incremental function will list the collections with incremental updates enabled.

The disable-incremental function will disable incremental updates, and enable periodic updates, on an array of collections. The periodic update schedule is set to daily, with a randomised hourly offset.

The enable-incremental function will enable incremental updates and periodic updates on an array of collections. The periodic update schedule is set to weekly, with a randomised hourly offset.

# site code.
$sitecode = 'lab'

# name of server hosting the sms provider.
$provider = 'sccm'

# create a recuring interval token with a cycle of x days.
# the start time will be randomised, but always on the hour.
function new-token($days = 1) {
  $class = gwmi -list -name root\sms\site_$sitecode -class sms_st_recurinterval -comp $provider
  $interval = $class.createinstance()
  $interval.dayspan = $days
  $interval.starttime = get-date (get-date '1/1/2016').addhours((get-random -max 24)) -format yyyyMMddHHmmss.000000+*** 
  return $interval
}

# get the names of all collections enabled for incremental updates.
function get-incremental() {
  $collections = @()
  gwmi -name root\sms\site_$sitecode -class sms_collection -comp $provider | %{
    $collection = [wmi]$_.__path
    if ($collection.refreshtype -band 4 -and $collection.collectionid -notlike 'sms*') {
      $collections += $collection.name
    }
  }
  return $collections
}

# configure the refresh cycle for an array of collections.
# set $type to 2 for periodic refresh only, and 6 for incremental and periodic.
# set $days to the number days between each periodic refresh.
function set-schedule([array]$collections, $type, $days) {
  $collections | %{
    if (! ($collection = gwmi -name root\sms\site_$sitecode -class sms_collection -comp $provider -filter "name = '$_'")) { return }
    $collection.refreshtype = $type
    $collection.refreshschedule = new-token $days
    #$collection.psbase()
    $collection.put() | out-null
  }
}

# disable incremental updates.
# i.e. enable periodic updates only, with a refresh cycle of 1 day.
function disable-incremental([array]$collections) {
  set-schedule $collections 2 1
}

# enable incremental updates.
# i.e. enable incremental and periodic updates, with a refresh cycle of 7 days.
function enable-incremental([array]$collections) {
  set-schedule $collections 6 7
}

To retrieve the name of all collections enabled for incremental updates:

get-incremental

To disable incremental updates on all collections listed in a file named disable.txt, and enable periodic updates with a daily cycle:

disable-incremental (get-content disable.txt)

To enable incremental and periodic updates on all collections listed in a file named disable.txt, with a weekly periodic refresh cycle:

enable-incremental (get-content enable.txt)