On Fri, Feb 07, 2025 at 03:57:49PM -0500, Melanie Plageman wrote: > As for relallfrozen, one of the justifications for adding it to > pg_class is actually for the visibility it would provide. We have no > way of knowing how many all-visible but not all-frozen pages there are > on users' systems without pg_visibility. If users had this > information, they could potentially tune their freeze-related settings > more aggressively. Regularly reading the whole visibility map with > pg_visibilitymap_summary() is pretty hard to justify on most > production systems. But querying pg_class every 10 minutes or > something is much more reasonable.
If we need it anyway, then I have no objections to using a freeze-related metric for a freeze-related feature. Okay, I'll actually look at the patches next... -- nathan
