High memory consumption in bind 9.18.2

[Raman kumar]

Hello Team,

While upgrading from BIND 9.16.10 to 9.18.2, we have observed high memory
consumption.

On version 9.16.2, RAM consumption was 3.8 GB. And on 9.18.2, RAM
consumption is 4.5 GB. Due to this an increase of approximately 20 % memory
is observed.

Is this the expected behaviour or any tuning is needed?

Thanks in advance.

Regards,
Raman
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