Microsoft KB Archive/147523

= XADM: Enabling or Disabling Circular Logging =

Article ID: 147523

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 4.0 Standard Edition
 * Microsoft Exchange Server 5.0 Standard Edition
 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q147523



SUMMARY
Microsoft Exchange Server version 4.0 has a feature called Circular Logging. This feature prevents the continuous build up of Microsoft Exchange database Transaction Log files on the hard drive. However, differential and incremental backups cannot be performed if this feature is enabled.



MORE INFORMATION
The Circular Logging feature is ENABLED by default when Microsoft Exchange Server is installed. You can toggle this feature separately for the Directory and the Information Store. This feature can be enabled or disabled through the Properties page of the Server object or through the registry. To enable or disable Circular Logging:

Through The Properties Page

 * 1) In the Properties page of the Server object, click on the Advanced tab.
 * 2) Check the Directory or Information Store box to enable Circular Logging. Clear the checkboxes to disable this feature.

Circular logging can also be set by editing the appropriate registry value listed below and then restarting the corresponding service. The value is read only at startup time of the services.

Through the Registry
For Directory Store Circular Logging

key:

  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services \MSExchangeDS\Parameters

value:

  Circular Logging 0=off; 1=on

For Information Store Circular Logging

key:

  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services \MSExchangeIS\ParametersSystem

value:

  Circular Logging 0=off; 1=on

Keywords: kbusage KB147523

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