Florian G. Pflug wrote:
There could be a GUC vacuum_freeze_limit, and the actual FreezeLimit would be calculated as
GetOldestXmin() - vacuum_freeze_limit


We already have that. It's called vacuum_freeze_min_age, and the default is 100 million transactions.

IIRC we added it late in the 8.2 release cycle when we changed the clog truncation point to depend on freeze limit.

--
  Heikki Linnakangas
  EnterpriseDB   http://www.enterprisedb.com

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