NoRefreshInterval

HKLM\SYSTEM\CurrentControlSet\Services\DNS\Zones\<Zone-name>

Description

Specifies the duration of the no-refresh interval for a resource record.

The no-refresh interval is the period during which servers cannot update the timestamp of the resource record, and the scavenging feature cannot delete the record. The no-refresh interval is designed to improve the performance of Active Directory-related services by concentrating write operations.

This entry and related entries configure the scavenging feature of the DNS server. The no-refresh interval for a record begins when its timestamp is updated. When the time specified by this entry expires, the refresh interval begins, during which servers have a specified period to update the timestamps of the resource record. During its refresh interval and the no-refresh interval, a record is protected and cannot be deleted by the scavenging feature of the DNS server. However, when both intervals expire, the DNS server can scavenge (delete) resource records that are still out of date.

You can specify the duration of the no-refresh interval for a zone by using three different methods. All of these methods change the value of NoRefreshInterval.

• By using the No refresh interval box on the Aging page for any zone.

• NoRefreshInterval directly stores the value of the No refresh interval box on the Aging page of the DNS console.

• By configuring all new Active Directory–integrated zones so that the duration of the no-refresh interval is set to a particular value by default.

• The default duration of the no-refresh interval for a new zone is stored in the value of DefaultNoRefreshInterval, and is copied to the value of NoRefreshInterval when a new Active Directory–integrated zone is created.

  DefaultNoRefreshInterval stores the setting in the Server Aging/Scavenging Properties dialog box.

• By applying the default configuration for a new zone to existing zones.

• When you select the Apply these settings to the existing Active Directory-integrated zones check box on the Server Aging/Scavenging Confirmation dialog box, the value of DefaultNoRefreshInterval is copied to the value of NoRefreshInterval and replaces any existing value.

Change method

To change the value of this entry, use the DNS console. Right-click the name of a zone, click Properties, click the General tab, and then click the Aging button. This entry stores the value in the No refresh interval field.

Activation method

DNS reads its registry entries only when it starts. You can change entries while the DNS server is running by using the DNS console. If you change entries by editing the registry, the changes are not effective until you restart the DNS server.

Note

This entry is used only when scavenging is enabled on the server (as specified in ScavengingInterval) and on the zone (as specified by the value of Aging). By default, scavenging is disabled.

Caution

DNS adds this entry to the registry when you use the DNS console to configure scavenging. Do not edit the registry to add, delete or change this value.

Related Entries

Aging

ScavengingInterval

DefaultAgingState

RefreshInterval

DefaultRefreshInterval

DefaultNoRefreshInterval