No database session was available to satisfy a request on the public folder database ‘%2’. The number of sessions configured via the Active Directory attribute msExchESEParamMaxSessions on the storage group may be set too low for the level of activity on this storage group. The current value for this parameter is %1.

Details
Product: Exchange
Event ID: 1165
Source: MSExchangeIS
Version: 8.0
Symbolic Name: msgidNoFreeJsesPublic
Message: No database session was available to satisfy a request on the public folder database ‘%2’.
The number of sessions configured via the Active Directory attribute msExchESEParamMaxSessions on the storage group may
be set too low for the level of activity on this storage group.
The current value for this parameter is %1.
   
Explanation

This Error event indicates that the parameter msExchESEParamMaxSessions may be set too low for the current level of activity on the server. If the parameter msExchESEParamMaxSessions is not present in Active Directory directory service, it is calculated from the following attributes on the Microsoft Exchange Information Store object:

  • msExchMaxPoolThreads (The default value is 50.)

  • msExchMaxThreads (The default value is 100.)

  • msExchBackgroundThreads (The default value is 57.)

The number of sessions configured is equal to:

(msExchMaxPoolThreads × number of processors) + msExchBackgroundThreads + (msExchMaxThreads × 3/4)

For more information about the msExchESEParamMaxSessions parameter, see the MSDN Web site.

   
User Action

To resolve this error, do one or more of the following:

  • Decrease the level of activity on the Exchange server that logged this event. For example, move mailboxes hosted on that server to a different server.

  • Adjust the attributes identified in the Explanation section to increase the number of available database sessions.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.

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