Any chance to do partial sign when RRSIG expires

[rams]

Hi,
Greetings !!!!
Currently in bind we are doing auto full sign when RRSIG expires . Is there
any chance to generate only RRSIGS instead of full sign.

the reason I am asking is when we have large zone and when it happens auto
RRSIG expire and full sign, the complete zone is going to full sign and
taking more memory. To avoid that is there any chance to generate only
RRSIGs like batch wise or any other alternation.

Regards.
Ramesh
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