Tom Lane <[EMAIL PROTECTED]> wrote: > Vacuum for XID wraparound would have to hit every page regardless.
There is one problem at this point. If we want to guarantee that there are no tuples that XIDs are older than pg_class.relfrozenxid, we must scan all pages for XID wraparound for every vacuums. So I used two thresholds for treating XIDs, that is commented as follows. Do you have better ideas for this point? /* * We use vacuum_freeze_min_age to determine whether a freeze scan is * needed, but half vacuum_freeze_min_age for the actual freeze limits * in order to prevent XID wraparound won't occur too frequently. */ Also, normal vacuums uses DSM and freeze-vacuum does not, so vacuums sometimes take longer time than usual. Doesn't the surprise bother us? Regards, --- ITAGAKI Takahiro NTT Open Source Software Center ---------------------------(end of broadcast)--------------------------- TIP 5: don't forget to increase your free space map settings
