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2.3 Memory requirements

Knot DNS implementation focuses on performance and thus can be quite demanding for memory. The rough estimate for memory requirements is 5-7 times of the size of the zone in text format. Again this is only an estimate and you are advised to do your own measurements before deploying Knot DNS into production.

Also note that to ensure uninterrupted serving of the zone, Knot DNS employs a Read-Copy-Update mechanism instead of locking and thus requires twice the amount of memory for the duration of incoming transfers.