Topic Last Modified: 2005-11-18

The Microsoft® Exchange Server Analyzer Tool reads the following registry entry to determine its current value:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeMTA\Parameters\DB data buffers per object

If the Exchange Server Analyzer finds the value for DB data buffers per object present and more than zero but set to anything other than 3 or 6, a non-default configuration message is displayed.

The DB data buffers per object value is the number of 4 kilobyte (KB) database server buffers that are configured for each database object. More buffers require more memory, but make it less likely for a database object to be rolled out to disk because of a lack of buffer space. One recommended reason for changing this value is in the case when a message transfer agent (MTA) communicates with multiple Exchange Server version 5.5 computers either within a site, or between sites. Then, it is recommended that you change the value to 6. If this MTA does not meet this criterion, you should change the value back to its default setting of 3.

This article contains information about editing the registry. Before you edit the registry, make sure 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 Regedit.exe or Regedt32.exe.

To revert to the default configuration

  1. Open a registry editor, such as Regedit.exe or Regedt32.exe.

  2. Navigate to: HKLM\System\CurrentControlSet\Services\MSExchangeMTA\Parameters

  3. In the right pane, locate and double-click the DB data buffers per object value.

  4. In the Value data field, enter 3, and then click OK.

  5. Close the registry editor and then restart the Microsoft Exchange MTA Stacks service for the change to take effect.

Before you edit the registry, and for information about how to edit the registry, see the Microsoft Knowledge Base article 256986, "Description of the Microsoft Windows Registry" (