Database Aging Keep Time interval has been modified from default

[This topic is intended to address a specific issue called out by the Exchange Server Analyzer Tool. You should apply it only to systems that have had the Exchange Server Analyzer Tool run against them and are experiencing that specific issue. The Exchange Server Analyzer Tool, available as a free download, remotely collects configuration data from each server in the topology and automatically analyzes the data. The resulting report details important configuration issues, potential problems, and nondefault product settings. By following these recommendations, you can achieve better performance, scalability, reliability, and uptime. For more information about the tool or to download the latest versions, see "Microsoft Exchange Analyzers" at]  

Topic Last Modified: 2011-01-21

The Microsoft® Exchange Best Practices Analyzer Tool reads the following registry entry to determine whether the default aging value for Exchange client view database indexes has been overridden:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIS\<Server name>\Private-<Private Information Store GUID>\Aging Keep Time

If the Analyzer tool finds the Aging Keep Time registry entry present and configured, a non-default configuration message is displayed.

Indexes used for views that are created in Exchange database tables by an Exchange client that have not been used for a given time are cleaned up at this point. The following registry entries are used to control index aging:

  • Aging Keep Time: The minimum index age before it is deleted. The default is 8 days for Exchange Server 5.5 and 40 days for Exchange 2000 Server, for Exchange Server 2003, for Exchange Server 2007, and for Exchange Server 2010.

  • Aging Clean Interval: The minimum time interval (milliseconds) between index age task runs. The default is 24 hours.

  • Reset Views: If this setting exists, and it is nonzero, this forces all cached indexes to be deleted during the next index aging task run. When the index aging is finished, the Reset Views value is set to 0.

We recommend that you not add the Aging Keep Time registry value unless you are directed to do this by Microsoft Customer Support Services.

This article contains information about how to modfiy the registry. Before you modfiy the registry, make sure that you understand how to restore the registry if a problem occurs. For information about how to restore the registry, view the "Restore the Registry" Help topic in Registry Editor (Regedit.exe or Regedt32.exe).

  1. Open Registry Editor.

  2. Locate the following registry subkey:

    HKLM\System\CurrentControlSet\Services\MSExchangeIS\<Server name>\Private-<Private Information Store GUID>

  3. Examine the Aging Keep Time value. Modify the value if you want.

  4. Close Registry Editor. If a change is made, restart the Exchange Server computer for the change to take effect.

Before you edit the registry, and for information about how to edit the registry, see Microsoft Knowledge Base article 256986, Windows registry information for advanced users.