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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