Avoid division-by-zero when calculating autovacuum MXID score. 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 <[email protected]> Author: Sami Imseih <[email protected]> Reviewed-by: Bharath Rupireddy <[email protected]> Discussion: https://postgr.es/m/CAD21AoC6nKeYAjTvJ9dmBea03GZK9222h_O%3DONmcVuxfyO88Bg%40mail.gmail.com Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/1f2297b548794a0fec502a9fc70c9970d96b09c4 Modified Files -------------- doc/src/sgml/maintenance.sgml | 6 ++++-- src/backend/postmaster/autovacuum.c | 11 ++++++++--- 2 files changed, 12 insertions(+), 5 deletions(-)
