muc archiving configuration for virtual host

hi, i 'm newbie in ejabberd,
i had install ejabberd with 10 virtual host (different domains) , i wan't to enable message archiving for all virtual host.
i need only admin or any specific user on that virtual host able to view message archive.
i 'm in testing and had install ejabberd last version.
how i can do this?

Another question:
can Mnesia handle 100k concurrent user message archiving without decrease performance ?

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