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Is checkpoint required any more?

I am running openldap-2.4.44 (source build) using lmdb backend with
configuration set in slapd.conf on a Linux machine.
The configuration includes dbnosync and also checkpoint settings.
The kernel vm settings are flushing dirty cache pages to disc
periodically, so my question is what is the reason for the checkpoint
setting if the kernel is already taking care of page flushing?