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In some cases, effective_multixact_freeze_max_age can be 0, which presents a division-by-zero hazard for the multixact ID age score calculation. To fix, bump it to 1 in that case so that we use the multixact ID age as the score. While at it, also document that this component score scales due to high multixact member space usage. Reported-by: Masahiko Sawada <sawada.mshk@gmail.com> Author: Sami Imseih <samimseih@gmail.com> Reviewed-by: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com> Discussion: https://postgr.es/m/CAD21AoC6nKeYAjTvJ9dmBea03GZK9222h_O%3DONmcVuxfyO88Bg%40mail.gmail.com