When Scavenging Occurs

The server stores a parameter called StartScavenging for each primary zone, which is the time after which the zone is eligible for scavenging. A DNS server performs a zone-scavenging pass only if the current time is greater than StartScavenging. (In addition, scavenging must be enabled for the server and the zone, and dynamic update must be enabled for the zone.) The StartScavenging parameter is set to the current time plus the refresh interval of the zone when the following events happen:

  • When scavenging is enabled for the zone

  • When dynamic update is enabled for the zone

  • When the zone is loaded

  • When the zone is resumed

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