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Enabling On Demand DNS resolution in SolarWinds NTA decreases the amount of database memory used to store DNS information and the read and write load on your SQL Server associated with domain name resolution.
With On Demand DNS resolution enabled, domain names are only resolved for device IP addresses that are actually displayed in SolarWinds NTA resources. Since they require persistent DNS resolution to calculate statistics, Top XX Domains, Top XX Traffic Destinations by Domain (report), and Top XX Traffic Sources by Domain (report) become unavailable with this setting.