Log Message:
-----------
Disallow the cost balancing code from resulting in a zero cost limit, which
causes a division-by-zero error in the vacuum code. This can happen when there
are more workers than cost limit units.
Per report from Galy Lee in
<200705310914(dot)l4V9E6JA094603(at)wwwmaster(dot)postgresql(dot)org>.
Modified Files:
--------------
pgsql/src/backend/postmaster:
autovacuum.c (r1.48 -> r1.49)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/autovacuum.c.diff?r1=1.48&r2=1.49)