Delays in presence updates or high latency in database operations may occur when OCS 2007 R2 and OCS 2007 R2, Group Chat are running under high concurrency

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Article ID: 2277375 - View products that this article applies to.
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SYMPTOMS

In a mixed Microsoft Office Communications Server (OCS) 2007 R2 and Microsoft Office Communications Server 2007 R2 Group Chat environment that is running under high concurrency, you may find delays in user presence updates or high latency in database operations.

CAUSE

This issue occurs because of the high presence polling rate of OCS 2007 R2 Group Chat Client. High presence polling rate requires the OCS 2007 R2 database to process the current presence status of all the users more frequently. Therefore, the load of the system is increased.

RESOLUTION

To resolve this issue, follow these steps:
  1. Install the following cumulative update for Office Communications Server 2007 R2 Group Chat Client:
    2032922 Description of the update for Office Communications Server 2007 R2 Group Chat Client: July 2010
  2. Set the polling frequency for OCS 2007 R2 Group Chat Client. To do this, follow these steps:
    1. Add a PresencePollFrequencySecond DWORD registry entry to the following registry subkey:
      HKEY_CURRENT_USER\Software\Policies\Microsoft\GroupChatConsole\Limits
    2. Set the value for the PresencePollFrequencySecond registry entry.
      Note The default and minimum value of the polling frequency is 125 seconds. The maximum value of the polling frequency is 3600 seconds.

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

You can monitor the following counters to determine whether the load on the Office Communications Server pool indicates performance related issues:

LC:Usrv – 00 – DBStore\USrv – 000 – Queue Latency (msec)
LC:Usrv – 00 – DBStore\USrv – 004 – Sproc Latency (msec)

Be aware that these counters may also indicate issues that can be resolved by necessary disk configuration as documented in the deployment guide.

Properties

Article ID: 2277375 - Last Review: July 22, 2010 - Revision: 1.0
APPLIES TO
  • Microsoft Office Communications Server 2007 R2 Group Chat client
Keywords: 
kbsurveynew kbqfe kbexpertiseinter kbprb KB2277375

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