Ian Gilfillan <ian@mariadb.org> writes:

Is there a reason replicate_rewrite_db is not available as a system variable, while other similar settings, such as replicate_do_db are?

I don't know of any specific reason, except that it is not implemented. Originally, none of these variables could be changed dynamically. Davi Arnaut (if I remember correctly) implemented making the filtering ones dynamic. replicate_rewrite_db was not part of that patch. - Kristian.